Ubiquiti - UniFi Dream Wall (UDW)

Run Cat6 not CCA to every room, 3-4 cables for APs to do POE, 3-4 Ubiquiti APs, and then you can use a Ubiquiti Dream Wall (UDW) which is a router/POE switch/AP all in one. You can buy an additional power supply for the UDW for redundant power and place the UDW in one of the AP spots centrally located in order to reduce the cable length to each location. Mount your APs to the ceiling in their respective locations and POE them with the UDW. Ubiquiti also has a site survey tool, WiFiman, as well as a floorplan tool to assist you in AP placement for best coverage estimate. I would make sure to put your UDW on a UPS so that you have that protection as well as uptime. When you run your Cat6 make sure you pull a pull wire through with it for possible future use.

I have two U7 Wall and a U7 Pro, reliability is ok but range with concrete walls is just absurd. Besides that I like the system a lot.

Moved from ASUS to Unifi. Reasonably low end kit for them, over 50 devices. Works like a dream. Even the Wi-Fi mesh.

Function split 👍👍👍 One Unifi Cloud Gateway Fibre, along with a U7-Pro hanging from the ceiling being powered off the CGF's POE+ port.

Don’t make the same mistake as I made and buy one of these pre-packaged mesh systems. They do work great but if you decide you need an extra satellite a year later for more coverage for whatever reason, chances are the model you need is no longer manufactured and the ‘new’ current model isn’t backwards compatible with your setup. Instead buy a long term modular system. There may be others but I’ve been using UniFi’s for a while now and I’ve expanded and updated different bits a few times over the years. I had to learn the hard way after buying two different ‘complete’ mesh systems before, one for home and one for work, neither of which could be upgraded (in practice) a little while later.

UniFi, hands down. I don't know what you consider "similar nonsense", - prosumer and a lot of business will use a controller that manages the configurations and statistics. The Cloud Key is a somewhat older implementation of the UniFi setup where it performed as the controller and an NVR for cameras. They've split that off - you can get gateways (router/controller) that does not have the video incorporated any longer. The "cloud" in some of their hardware doesn't mean it's run from the cloud or whatever, it's simply part of the model name. You can run it all standalone without being tied to their servers (though it's pretty convenient at times). Similarly, they have "mesh" in the name of some of their APs - but all of them can be wirelessly uplinked. It's a matter of them associating through marketing to the massive consumer "mesh" marketing. But it's still prosumer stuff and uses the same controller as the rest. My favorite feature is reliability. It's been rock solid for me through 6 years (I've moved through three upgrades and it's just stable. I love it. Look at the Dream Router 7, UniFi Express models, and Cloud Gateway models for some pretty darned good home solutions. The Dream Machines are great also, they are rack mount though and tilt towards having the video features. Should you choose one of the simpler offerings and want to go video later - there are standalone DVRs - including the Cloud Key+, which is still popular - that you can add. There is other prosumer gear, but Ubiquiti UniFi and TP-Link Omada are the only ones I know of with the unified management.

I am a fan of the Unifi Cloud Gateway series. Have the fiber version myself, which can also be used for UTP WAN. Not coax. 

For your setup Best signal: Unify Cloud Gateway Router, and U6+ or U7 Pro OR Simplest: UDR7 OR Lowest cost: Unify Express 7

Any Cloud Gateway from Ubiquiti paired with AP’s. Easy to setup and manage.

Asus Expert Router EBG19P seems to have some benefits over Ubiquiti Cloud Gateway, such as more ports. But it's hard to argue the awesomeness of Ubiquiti UI - I love my UDM Pro. Props to ASUS WRT (Merlin) too. Like others said, just turn off DHCP and WiFi on the ATT Gateway and let your router do the lifting. Couple with Asus Zen Wifi or TP-Link Deco mesh system in access point model for expandable, upgradeable wireless. Eero won't support this setup (no AP mode).