Bought a few AX3000Ts for the house.
Flashing OpenWRT was very simple with XMiR-Patcher
Setting up 802.11r and running cables was a pain, but it's done now and everyone across the home has good wifi speeds and signal.
Would recommend, for the price it's one of the best routers I've had.
Adblock-fast has been working fine, same with attended sysupgrades and whatever else I wanted to try. Would recommend.