Camera installation is discussed in the Precision Landing course where it is used.
The ribbon cable is first wrapped in aluminum foil to prevent signal degradation, then with electrical tape.
The camera is placed on the underside as shown below (bottom view),
then the cable is inserted into the RPi camera slot (top view).
Use the STL file here to print out the case -
https://community.dojofordrones.com/t/rpi-camera-stl-file/513