Not tried it but I would imagine that it will connect but not be stable, might slip down the glass. It's not going to be a case of 9.5mm is fine, 10mm it doesn't work at all. Although maybe someone who has actually tried it will be along
I have two on the back wall of a reefer 300 g2 which is 10mm and they have been fine. It's easy to knock then off if I bump them but they stay put other than that.