I have these Renthal Twinwall bars which have a crossbar, like the oldfashioned 7/8" bars, so I had the same problem.
Scotts offers a curved crossbar but I made my own one out of a piece of 12 mm aluminium from the hardware store. I did cut away a small portion of the lower part of the crossbar pad, so that I was able to easily reach the adjuster knob.
But all that isn't necessary because just like someone else already mentioned you can turn around the actuation arm of the damper and then mount the damper "backwards". You should buy and use the arm-puller tool from Scotts for this (isn't expensive)