If you HAVE to use an external service loop on the crossbar this can be done in a clean fashion with a little matching flexloom, heatshrink and chassis grommets. With a 3-Some on the tower only you and your tech will notice.
Just stay at least 1.25" away from the joint. One hole in the correct location is okay. Two holes is swiss cheese.
Technicians aren't earning their pay if you don't allow them to drill a hole here and there.

David
Earmark Marine