I have a 6000 series but have not tested UE5 in linux.
I wanted to say one small thing though. Valves new “Steam Deck” is using 6000 series APU. It is running linux (SteamOS, with Proton so it can play windows games). So if the drivers are not good now, they will get better before launch (December).
Judging by what i have seen i think they have vastly improved since the old days.