The correct screws for mounting the backup power supply units arrived today so they were attached to the bottom of the GTX 45R mounting brackets. I also added a padded adel clamp to support the wires that go to the GSU 25, will still need to add a cushion and cable tie where those wires pass the bracket, just can't get the wires away fro the bracket with an additional clamp so will tie it tight and padded instead.