I spent today in the shed working on the GSU25 and GEA24 mounting. I installed the GSU25 on the front top rib. The holes in the unit are quite large, so I am using 5mm screws with 5mm rivnuts, ( the 5mm screws I have are not long enough, another purchase required ). The GEA24 has four D-Sub connectors, so I wanted to ensure all connectors could be plugged in without any interference from the flange on the bottom of the front top rib. I made a bracket which allows the GEA24 to sit off the front top rib, ensuring plenty of room for the D-Sub connectors.