[GaryVoshol]

Your Frame Perimeter is defined by the outermost points of your Robot, located between 2 and 10 inches off the ground. If your "mezzanine" is the outermost part of your Robot, and it's located no more than 10" off the floor, it defines your Frame Perimeter and that's where your Bumpers must be attached. If another part of your Robot is wider, then that wider part is where the Bumpers must go. You could also use properly spaced stand-offs attached to your mezzanine to define your Frame Perimeter.