I've picked up a Super Clamp (yet to receive it) and a Manfrotto 099b in the yard ...which way is more secure way to mount the superclamp...with handle that tightens above or below?
AND WHERE ARE ALL OF THE SAFETY CABLES?
yeah, you'd be surprised the number of people I've seen not use a safety cable... That more hasn't gone wrong is a small miracle.
Two things I've noticed with the super; the more convenient the handle is, the more likely it is that I can get it cranked on and the more accessible it is to be knocked loose. I've also found the opposite holds true as well (again, ymmv, just my experience). I opt for the later (less accessible, so underneath in your example) usually when possible as I generally don't worry about getting it on tight enough so much as an accident happening and the handle getting knocked loose.