Stop having Power Supplies lying on the ground or lying down in the Cabinet.  Mounting them will save your PS from Overheating and from Water Damage (if water goes onto the floor or bottom of cabinet).
 
This Power Supply Mount will mount the following size of Power Supplies 1"1/4 to 2"1/4.  Ecotech MP10, MP40 and Vectras fit in these.  Other Products you will need to measure it.