How to wall-mount this whiteboard
Just mount a couple 2x4's horizontally on the wall with whatever anchor you prefer, and mount the white board to the 2x4's.  A regular 2x4 is 1-1/2" thick.  The 2x4's will get you just over the conduit as long as you can avoid the set screws on the coupling.  If you need to go a little thicker, you could screw a strip of plywood on top of the 2x4's to add another 1/2" or 3/4".