1 pointI tried with just one screw but the arms rotated.
1 pointThe arm seem a little bit short. See if with the house in the tray you do have space enough to use the clamps, if it does not reduce the access to any function of the housing. David refers 200mm/5” arms, but it was a mistake. 200mm is 8”. To secure the tripod base (the arms used as tripod base) you should use 2 screws in each, to avoid the arm to rotate.