Have the "manual" version installed on my C6. It gets scraped often on parking bumpers and concrete curbing meant to stop cars when bumpers aren't used. Every once in a while, I have been 'surprised' by a bumper... and recently bent the attaching bars. I will include a picture of the results. However, if you don't drive your Vette that often, and you are careful, you'll probably be OK.
Note: In the picture, I hit the 'high' parking bumper pretty hard, and the forks are no longer perpendicular to the holder. I am sure it can be adequately straightened.