Raspberry mini size camera holder

Adapt angle used in FreeCAD model to the one you need.

Supergluing camera to holder and holder to window should be no problem for many months timelapse, can be removed easily with screwdriver/knife if needed in the end.

One of the early timelapses shot with that setup (scaled down for video size):

Related forum thread:
"3D printed mini size Pi0 camera holder for many months time-lapse"
https://forums.raspberrypi.com/viewtopic.php?t=327641