nope.
I don't recommend it for garage parkers, but my best mobile setup was a 102 off the trunk lid on my '82 malibu. he doesn't have a deck lid so...
if I had had a roof rack, I'm sure I would have put it there.
height makes might.
it does limit your drive through options though.
You would have a serious grounding problem on a roof rack. Seen it happen way too often.