The mounting system that was used in the model I remixed worked pretty well except for two key issues:

1. I have a Raspberry Pi Camera Module V3, and the camera case is circular which seemed to be cutting off the camera's ability to focus. I merely expanded and squared off the aperture so that all of the light can get in and it can focus correctly.
2. I wanted to mount the camera on the rail, using the same system that my Raspberry Pi case used, so it could be mounted right next to it.

This remix is my designed mount, and the aperture modification (no other changes were made to the original model).

For the rail mount you will want the “Pin” model found here: https://www.printables.com/model/370389-sovol-sv06-enhanced-tool-holder/files

Update: as pointed out in the comments I did not link the Pi case itself. It is available here: https://www.thingiverse.com/thing:5919343