Have you thought about the overhead console? (that's what I did to my FX, see my signature). That would be one way to not even touch your dash.
On that cubby hole, not sure if you could angle it up so that it would be really visible for the driver without losing the cup holders. If the monitor you're going to use are not sunlight readable, crazy expensive transflective monitors, then it should be as close to your eyes as possible, and if you could turn them or tilt to your point of view, even better.