How do I make any part's normal point upwards?

I made a dice spin while anchored and it works, but there are cases where it’s unclear what side it landed on because two normals (e.g. the top and right) are pointing upwards at almost the same height.

So I want to set the orientation of the dice to make it so that the one that’s slightly higher is forced to point perpendicularly. But how would I go about making that?