Mitch, I'd think the center mount clip would make more sense to the left side of the screen (assuming you're not trying to make it accessible to the passenger). Is there a reason this wouldn't be the case? I like it lower so if I have it charging the cable isn't draped all the way from the vent.
Bill
Sure, the vent clip is the one I'll use most of the time, but I figured I would try both. I also have an old blackberry (for work), was thinking about getting a holder for it, possibly. I had a %15 off coupon, plus with the quick change adapters they have, you can move the mounts between vehicles, or even different mounts (as you can see). I only have 1 iPhone mount, I can put it in either position, or move it to my old 1994 Suburban when I'm using it (rarely, just plowing in the winter or moving stuff around)
ProClip is not inexpensive, but it is the most versatile system out their, look how quickly they designed the Model S mounts.. These where $30 each, plus you have to add in shipping & tax
FYI, the mount on the center screen only clips on, and can easily be removed or repositioned (but the far right is the only place where the device wouldn't block some part of the touch screen), the vent mount has adhesive that sticks to the vent, so not as easily moved around.