Added a bracket to the layout control panel today, it was a pair left over from an "over-the-door-hanger" kit. 

I bent it to the desired angle in a vice, the slots running the length of the upper section enabled me to screw the bracket to the shelf.

I used "Command" brand picture hanging strips to secure the controller to the bracket - they are stronger than normal velcro, so far they appear to be holding well.