Where does the panel stand on recommended access points – at the moment, I have a BT Home Hub 5 under the stairs which is useless for wifi (admittedly it's sub-optimal positioning, but that's where the telephone line lives) and nothing connects to it? But it pipes the internet through a powerline ethernet adapter to an old BT Home Hub 3 in the bedroom repurposed as an access point. I have that set up now and pretty much everything connects to it, such as all the Sonos devices (which will only connect to a single ssid network).
That said, while the BT Home Hub 3 appears to do well at putting wiffle rays out to devices on the ground floor (I assume the floors and joists don't put up much resistance), the signal upstairs is crap. The Asbestos Palace has solid brick and breezeblock walls and embedded in those walls are wardrobes which my wife has spent the last five years filling with her clothes and shoes, cramming more and more in, and promising that yes, one day, she'll have a clear out. That day, I doubt will ever come and she's not about to stop buying shoes, so assume a growing hyperdense mass of radio frequency-absorbing feminine footwear and clothes that 'don't fit' even though she bought them yesterday and she doesn't appear to have worn them.
Anyway, wiffle-waffle aside, there's nowhere to plug aerials or anything to boost the Home Hub 3 and I think it's officially a bit shit at putting out a wifi signal. My understanding is that range extenders piggyback the current signal so need a decent signal to start with and can result in congestion etc. so I think I need a more powerful a/p with enough aerials to look like a Russian military base.