I have the same towel bar and it goes over the top of the under sink cabinet. I didn't modify anything except to add little fuzzy pads to it to protect the wood. We flip it to the inside of the cabinet when we aren't in need of towels and back out for general use. We have a slide out so it is out of our walking path. I'm not sure I'd like the visual break in my face when I look in the door or down the length of the coach with Ron's set up but to each his own. I'd try it over the cabinet door first and if that doesn't work, start modifying. I personally try to avoid adding screw holes to the rig.