Hi Magnus,
Phase issues usually only come in to play when you have 2 mics recording the same instrument (vocals, guitars, Snare, all the same), and the mics are very close to each other.
If this happens there is a “phase switch’ where you can reverse the phase on one of the mics. You can do this in UC Surface. (Little icon that looks like a circle with a line drawn through it).
You will know there is an issue because the recording will sound “thin”.
All that being said, this should NOT be an issue with room mic
Good luck✌️