I have tried many different camera mounts and this works great.
1. I use 2 layers of foam covers designed for tip-ups. They have a hole in the center and a slot that I can put the camera cable through.
2. I stagger the slots so that they do not overlap.
3. Once this is done, I flatten the camera tripod thing on top and anchor the cable with a large clip.
4. Now, to adjust the angle for the direction of the camera I simply spin the top foam piece. This is very exact.
5. My hole does not freeze over, even at -10 yesterday.