I have the ARB license plate relocation bracket and wanted to add an Alpine reversing camera to the bracket. This works perfectly.
I actually mounted the bottom half of the bracket to the number plate using double sided mounting tape.
Zip ties through the holes up the centre hold the camera in place without any further fixing.
The camera is angled at 30 degrees and this gives a good view. (35 degrees may have been a little better with hindsight.)