How to mount the control module of ROSS?

First of all, I'd like to thank you folks for posting all the tips & tricks on the ROSS. It has given me much more confidence to go ahead with the system. I have one question though. Chuck mentioned that you mounted the control module using velcro, but I am afraid that it will fall off later. I read the Universal Installation Instruction on Rostra's page and they suggested to drill a 1/4" hole on the chassis to install the control module using the bolt. Has anyone tried installing the control module this way? Thanks again for your helps.