I downloaded the fantastic case by ksamuelsen with a boom for the camera. Unfortunately on the ender 5 configuration the pi cam cable wasn’t long enough to get to the print area, so I designed a mount that goes in his rail and screws into my horizontal upper rail using t nuts.

I added a screw hole and nut relief into the mount to prevent it from sliding in the rail, but the fit on mine is precise enough that I did not need to install a screw. That screw is m3*6

The two screws used to connect the adapter to the extrusion are m2, not sure what length I used, sorry. You will need t nuts or something that will fit in your extrusion relief for your application.

Link to case I designed this for (may work for others, appears to be standard dimensions)
https://www.thingiverse.com/thing:3079477

resolution and infill don't matter

Inventor file included so you can modify for your needs

I told thingiverse that I printed this on an ender 5 but for some reason the page insists I must have used a 3 pro

Creality

Ender 5

No

No

0.20

20%