I bought a Ubiquiti Unifi Pro a couple of years ago for our 3 storey house with a view to adding a second repeater upstairs. I never got around to fitting the second as the base unit gives the whole house and garden 50mbps+ with 10+ devices connected.
We ran Cat 6 to main hubs (office, kitchen, downstairs and garage where the switch sits) and put a Synology router and their mesh extenders on the end of the Cat 6 in a few locations. Been flawless and not too expensive to set up.
The Router is in the office, which is ideal, & close enough to he kids, will prob run Cat 6 to the kids consoles as they are close, don't really want to run any more as its a hassle- done loads previously and stuff gets damaged, managing to hide them without massive disruption etc..
I'm perfectly happy with plebian BT mini disc mesh. Think they were on discount at £70 for three which covers on the dead spots of a three story terrace very nicely.