I'm familiar with MO2 from when I used windows, but I had a hard time getting it working on Linux. First problem was getting it installed. I found https://github.com/sonic2kk/steamtinkerlaunch which is supposed to let you install it into each game's wine/proton prefix which worked, but when I then tried to launch the game it would run with absolute terribile performance (like even just the title screen would lag and stutter...)

How did you install it? Maybe with a different method it would work for me better (even though now I'll probably just stick with my own tool I'm still curious)