Not knowing how much equipment you have...we always prefer fixed racks over wall mounted. What about putting the rack front face the door, 3ft from the LV panels and the back of the rack 3ft (or more) from the drain pipe on back wall. Build a riser if they want it off the ground. Cable tray in a "T" formation from the back wall out to the rack out in the room. The cable tray will give you a spot for all your "service loops" as well. Here is an example of some racks we just rolled on-site..