This was an idea to mount the mini-rambo board for my Prusa right out on the power supply. I have been messing with the board so much I really want it is a more accessible location.
Using the spacing of the holes on the NES350 and the above diagram, it was easy to calculate the length of the arms. I think I made these 3.5mm higher than the screw heads.
Mounted it should have good airflow and be easy to get to the connections.