@Dijin Go through this FAQ for more details on your question.

@KarthickShankai Yes, that's true. Check the Archer C50 ethernet ports tech specs here. Nevertheless its wireless radio (5G) supports speed up to 867 mbps, the bottleneck is its Internet (WAN) port....

@imaddicted2u2 That's not possible. Best approach is to make some notes (for example in notepad) or screenshots for A7 configuration. Then use these notes / screenshots to transfer the configuration...

@Loi_ When using WDS feature the router doesn't use its Internet (WAN) port and any MAC address change would be irrelevant in this case.

@Thunderlight Here's the list of routers supporting DOH and DOT.

@WifiFan Sure, as long as you use the A7 in router mode, the guest network can be isolated. Just connect your main touter LAN port to A7 WAN port and configure as standard - details (use Dynamic IP).