Ideas for mounting REAR dashcam?

I've run all my wires and had my rear dashcam set up for a bit, basically set up something like this:
https://cdn.shopify.com/s/files/1/2983/5972/files/IMG_1434_1024x1024.JPG?v=1558999057

Held on to the ceiling via that headliner clip. I didn't end up liking it for 2 main reasons:
- While fairly low profile, I managed to knock it a bunch with either my head or cargo
- I guess I could have adjusted further, but it sits "back" from the window, so any dirt easily gets in the way plus the heating element lines.

I was thinking I'd actually rather have it mounted to the hatch and to raise up out of the way when the hatch is open.

I'm not really sure HOW to go about this though - with the hatch closed, there is seemingly no gap between the window frame and the car frame/weatherstripping.

Any ideas for how to attach the camera to the hatch door frame rather than the back window?