I permanently glued one of those supplied 3M sticky mounts on the windshield right behind the rearview mirror on the passenger side. From the driver position, you don't see the camera at all. This mounting point provides a great view of the track and the line, great for post-track-day-analysis
Since I don't have a sunroof, I used the suction cup to mount the camera on the rear glass. This was to be able to see my driving inputs. However, once I observed my inputs were nice and smooth
, I did not find any additional value to this view point. I prefer a clear view of the track to be able to analyze how well I am able to put the car where I want.