Totolink X5000R. 50-70€. OpenWRT support. Wifi 6e on 2.4 & 5 GHz Bands.
But I can highly recommend to get Wifi 6 on the 2.4 GHz Band, too. I've finally gotten usable 2.4GHz again as that band was stuck on Wifi 4 (Wifi 5 (ac) was a 5Ghz improvement only).
No outdoor use unless power is capped massively
Due to all of that I mostly ignored the 6GHz wifi stuff.... So interesting to hear it's working for you. That's the first time I hear someone from Europe say it's working for them.