Aligning STL Model to a Plane

I have a STL model that came in crooked and need to align Flat on the surface to the Cplane. An easy way to align would be of great help. Need to cut on CNC but it’s skewed when I export to another CAM software.

Hello - there are a couple of ways - Orient3Pt is probably the most versatile - use the Vertex osnap for the first three points.