If you’re going to do it, I recommend a GoPro MAX mounted on the ceiling above and just behind the pilot/copilot head. The 360 files are truly 360, and using the GoPro Quik app you can pan right/left/up/down to examine your sight picture and the right half of your panel (can see attitude indicator, altimeter, VSI). With this camera, you only need to worry about hitting record at the beginning of the flight. In my short experience with it, it does not really matter how you angle it.
Edit: PS
Here is a video you can use to test if the Max will meet your needs. If you’re on an iOS device, make sure that you open the link using a non-Safari browser such as Google Chrome, or else you will not be able to use the 360 features.