I've built this model to mount a Camera into my Mercedes Benz CL203 (Mercedes Benz C Class sport coupe from 2003).
Long Story short: I bought a radio and a Camera specifically for my car but ended up ordering a W203 by mistake (it seems like CL203 and W203 might share some parts, but not the back plate's lights…) Now that I've bought a 3D printer, I finally went through the adventure of designing the holder and installing the camera.
These are the holes that you'll need to drill in the Trunk Handle:
The author marked this model as their own original creation.