Glass mount antennas usually won't work on newer vehicles with factory tint due to the tint have metal in it. My Escape has factory tint. And a portable will still need an outside antenna. I'll probably end up going with an articulate mount like posted above. The next thing after that is running the cable inside. There really isn't a good place at the rear lift gate to get a coax cable through.
If it was an older vehicle, I would have already drilled a hole for a NMO mount.