I don;t do mesh, but I had from a Netgear R8500 in the basement to cover the first floor and an Archer C7 in the upstairs office to cover the first floor, both wired. I eventually wired my main home theater gear as wireless was inconsistent. I recenlty put in 2 Ubiquiti UniFi Nano HDs, one upstairs center of house and the other on main floor in a closet (again both POE wired) and I am amazed at the coverage of these. My wif's work laptop has WiFi 6 chipset and through 2 walls 15 feet from the closets WAP gets a 1.1gb connection with speed tests. This BS of 5GHz fading through walls I am not seeing. can drive 300-400mb speedtests from 2 floors away and through many walls. The biggest week spot is the back of my basement which has a drop ceiling and I suspect all the metal wires and rails hurt it, but I still can pull 100mbs form 2 floors away. Our 2 year old iPads can get 300-400mbs in many areas and rarely drop below 200 mbs in the weaker sections of home. These WAPs can mesh as well, not sure how well they do that, but these are incredible, they are only 2 band and 5GHz goes to 1733 and has 4x4 MU-MIMO, no WiFi 6, but with these speeds I don't think I care.
LG 77 C9 (Also LG 65 C7 and Sony XBR55X900E)
Klipsch RP-280F / RC-62ii / RP-140SA / RS-35 / RS-25
Dual PSA V1800s