Well, I got Monado and libsurvive running some time ago (Valve Index, X11, Nvidia), even for Beat Saber. It sadly was unplayable, because reflections were wrong in VR apps, it felt like both eyes using the same reflection angle instead of adjusting it to each eye. For close objects this was bearable, anything further away would look "wrong" and cause VR sickness. Also the FoV was wrong, it felt like a vignette around the screen edges, a good bit narrower than in SteamVR. Oh yeah, and the latest version did not build for me, used a previous one.

Performance, especially in Beat Saber, was great and better than SteamVR!

I would expect SteamVR to at least work enough for calibration. You could try switching to beta or other versions.