The non "pro" version is quite fine for 99% of the cases.
https://www.amazon.com/Ubiquiti-UAP-AC-M-US-Unifi-Access-Point/dp/B01N9FIELY
Its only a hundred each. I setup a 6 set in a concrete house (1+ foot concrete walls) that had issues with connectivity and works a treat. The biggest issue with these devices is you gotta be a widdle bit technical to get them configured initially and they have no web interface. You need to run a management program on a pc to get em configured, but haven't had to touch them again since then. Highly recommended.
In fact, the Ubiquiti UAP-AC-M-US Unifi Mesh Access Point super outperforms my ultra fancy 300 dollar Asus gaming router. (This really pissed me off btw) Can't reccomend Ubiquity stuff enough for wifi.