A lot of the Golds I've seen fitted to rectangular Chatsworths have been the soft butyl rubber surround variants.
I've seen the cones wobble around a bit when I've transported Tannoys. The state of our roads can be pretty crap and I'd rather they wobble forward and back in the direction the cone is designed to move than in the other plane, which is why I prefer them on their backs.
Oh, just noticed it was 'Chatsworth sized cabinets', not 'Chatsworth cabinets', so perhaps they do have hard edges after all :-/