Optimal, set up for the airport and the power network line?

Hoping to any network gurus can advise on the optimal configuration for my network.  Current configuration is as follows.  1 Zyxel DSL modem configured to act as the router, PPPoE (not the bridge mode) mode, which is the default value.  2. Airport Time Capsule (ATC) connected to the modem via an ethernet cable plugged into the WAN ATC port.  ATC configured in Bridge mode.  Adapter network line connected to the LAN of the ATC port.  2nd line network adapter is connected to the opposite end of the House where the Time Capsule wireless signal is weak to non-existent.  Airport Express (AE) plugged into 2nd network adapter line.  I have a lot of devices (computers, printers, cell phones, DVR, etc.) which must connect wirelessly to the network.  Here are my questions:

1. is it better to act as the router, rather than on the bridge, as I have to reconfigure the modem in Bridge mode and the most convenient way to connect using PPPoE Airport Airport?  Or is it not important?

2. my hope is that by using the network adapters and the AE in the part of my house with the worst WiFi signal, I can push the range of my network and all devices to give a good signal.  My hope is that the devices will be connected to any signal is stronger.  At present, ATC and EI do not have the same network name (or password).  It is better for them to broadcast 2 differently named networks, or both would be they networks of broadcast with the same name and password.  Or is it not important?  Is how important it that the ATC is able 802.11ac, EI is just 802.11n?  For reasons not clear to me, even though I have several 802.11ac devices (MacBook Pro and Nexus5x), they are on the 2.4 ghz band (I even if ca is the 5 ghz).  Don't know if something is set up wrong on my ATC.

All the equipment is running the latest version of the software (OS X, iOS, Android, etc.).

Thanks for any advice.

1. is it better to act as the router, rather than on the bridge, as I have to reconfigure the modem in Bridge mode and the most convenient way to connect using PPPoE Airport Airport?  Or is it not important?

Doesn't matter, unless there is a special feature like the network option of comments on the airport... that would require that the airport be configured as router.  Airports are not known for their reliability, PPPoE, so it is best to have the modem or modem/router to provide the credentials of the PPPoE connection.

2. my hope is that by using the network adapters and the AE in the part of my house with the worst WiFi signal, I can push the range of my network and all devices to give a good signal.  My hope is that the devices will be connected to any signal is stronger.

If the two access points use the same wireless network name and password, Mac will do a nice job of automatically move from one access point to another to pick up the best quality signal as they move home... but iPhones, iPads, and most of the PC will not.  If you name the two networks as well, so you will need to get used to temporarily disable WiFi on iPhone, iPad, etc. When you move from one region to the other. Then, when the device is in the new location, turn on the WiFi and the device usually pick the strongest signal from the nearest access point.

If you use names of separate network for access points, you need to manually switch networks on each device whenever the camera moves from one region to the other.

Is how important it that the ATC is able 802.11ac, EI is just 802.11n?

Well, you know that the Express is not "ac" capable, so any device "ac" close the Express will connect at low speed "n".  You will probably not notice a difference in respect if your Internet speed is less the Express features.  If you copy large files from one computer to another or backup on the network, then a device that connects to the Express is going to be slower than a device capable of "ac" that connects to the ATC.

For reasons not clear to me, even though I have several 802.11ac devices (MacBook Pro and Nexus5x), they are on the 2.4 ghz band (I even if ca is the 5 ghz)

Everything in the wireless is a compromise. In other words, to get something, you must give up another.  "ca" is used to that in the band 5 GHz, so if your devices are connect 2.4 GHz, they connect to a slower 2.4 GHz signal.

Here is the compromise...

5 GHz signals have capacities of speed much higher than the 2.4 GHz signals... BUT... 5 GHz signals are significantly weaker than the 2.4 GHz signals. So you're really not going to get the benefit of 5 GHz, if your device "ac" is in the same room or it has line-of-sight with the router "ac".

If a device of "ac" is a room or two away from the router "ac"... the device will probably connect 2.4 GHz... because these signals are more powerful penetration of walls and other obstacles a lot better than 5 GHz can never hope.  It is also possible that the 2.4 GHz signal several rooms away the router will also be the fastest signal at this location, because the signal slows down more it moves the router.  5 GHz quickly signals really slow down.

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