Much like passenger doors without a frame surrounding the window, there are hatches where the upper part of the rear window isn't surrounded by a metal frame. It's a bad idea to hook the upper straps around the edge of the glass in this case. I'm car shopping myself and there was a 2004-ish Hyundai Elantra I had to walk away from because I couldn't put a rack on it.
I recommend checking the fit guides for Yakima and Thule too. There could also be notes saying it's ok if the lower bar is resting on the bumper. In you don't do that the straps could be left carrying the entire load and I'm not sure they're rated to do so. Same thing goes for a mini-van.