You can already do the leveling by including a small object in your scans that has 3 known points.
You can then place control points in the images with these three points (X, origin and Z)
When you have a control point selected, you will see in your 1ds view that its set to ‘Tie point’ you will want to change this to Ground Control, and enter its coordinates in so that your three points have exact X Y Z positions (this is why you build a small device or just a tiny flat surface on your turntable)
I do this with most of my scans.