I've been looking at a Mesh system. We used to use extenders but after experiments with various makes/models they all proved so ropey, we switched instead to using Powerline ethernet and then pulling an ethernet cable into an extender configured as an access point (i.e. the AP gets it's connection via Powerline ethernet effectively). That is more stable but still seems to require re-jigging every couple of weeks, which involves me running up and down stairs trying to get the damn things to resync. Not quite got to the stage where I've sufficiently lost patience with it to justify spending 100+quid on a mesh system, but very close. So for future reference, if you get the one with two thingies, do you plug one thingie in next to your router then have one where you need the extra coverage? Or do they both act as extenders from the base WIFI?
When we had the house rewired when we bought it we also got the sparky to run cat5 cables from behind where the router sits to certain rooms where we thought we might need it for TV's etc.
So basically one of the thingy's is hard wired to the router through cabling in the house, with a short cat 5 plugged into the socket in the bedroom (as that is the room physically nearest the office) and sits on the bedroom window cill (they also need their own power source).
The other one sits up here on my desk in the office (again has to be plugged into power socket), connecting to the other via wi-fi, in addition my laptop connects to it here via wi-fi (signal is good enough for zoom teams etc, albeit goes a little shit if I have things like google earth running at the same time) whilst the socket in the bottom of the thingy has a short cat5 which is plugged into the phone. It also means that we have Wi-fi throughout the garden which is handy occasionally.
All sets up via an app on your phone, I am a complete luddite and I managed it.
I used Powerlines for a bit when the hard wiring packed up but they were pretty unreliable (and obvs the phone wouldn't work), I would have stuck with the BT Complete thingy as the signal with the extender you get with that was fine up here, the problem was I needed something to plug the phone into and the Deco thingy provided that capability.