Just posting to add my limited experience with this issue too.
I have a 2080Ti, two of my monitors are plugged in via HDMI (2x 1920x1080 60hz) and one via DP (3440x1440 144hz). I should add that I do have the vive wireless adapter connected to the computer, but it's not on the VP2 yet (forgot an accessory). I also have a elgato capture card plugged in too but none of the monitors are connected to it at the moment.
At high, it runs fine.
At ultra, it gives me the maximum number of monitors error. Which was expected. However when I unplug one of the HDMI monitors it still doesn't work. I have to unplug both of my HDMI monitors for it to not have the error. I've also tried dropping the refresh rate which didn't make a difference.
It's inconvenient to say the least, but also not what I was expecting if the other post is accurate that it should at least be able to tolerate two monitors. That said, my long term intention is to get the wireless working on this, but I'm curious if I'll run into similar issues.