UBL allows you to tilt the mesh. But there is seldom a reason to do that. The mesh bed leveling works very well.
The isn't any down side to using a 10 x 10 mesh instead of a 5 x 5 mesh. Depending on the peaks and valleys... You may get better results with more mesh points.
The isn't any down side to using a 10 x 10 mesh instead of a 5 x 5 mesh. Depending on the peaks and valleys... You may get better results with more mesh points.