Hi guys. I have just moved house and am experimenting with making my WiFi more usable. I have a virgin router in modem mode and a decent Netgear nighthawk supplying main WiFi.

I need to add an access point as itís quite a solid house and not getting WiFi upstairss in some places. Do I need to add a specific brand? I have cat 5 laid to several locations so I can use a wired access point right? How do I make sure itís all one continuous network?

Finally is there any issue using an old Apple AirPort Extreme I have and plug it into my router to create a privately network for some smart home stuff eg ring so itís not competing for bandwidth?
With thanks!