With a soldering iron, place 2x M3 inserts here:

Then place 2x M3x25 screws here, used to adjust the angle of the camera, plus 2 nuts to lock the screw positions:

Put the mobile support in the base and secure the axis with two self-tapping 3x8mm screws (thermoplastic screws):

Then place the camera’s back holes in front of the holes of the mobile support part and put in 2x M3x6 screws:

Put in 4x self-tapping 2.5x6mm screws:

Thanks to Xingdong Zuo for the contribution of this camera mount assembly guide.