Anything is better than taking off some of the underbelly, which is a huge PITA.
You can use a length of garden hose as a conduit or get some other conduit and lash that along under the underbelly then go up through any hole available (eg, punch out any sealer where some wires go now), or drill your own holes as PT said.
Each rig is unique in opportunities to get down through the floor. EG ours has a gap in the underbelly between water tanks where the spare tire hanger is.
The Trimetric monitor display is very bright, and the light is "in your face" so be careful where you mount/aim it.
