I can't identify the make of those shocks, but they aren't necessarily upside down, I had a set of "Bitubo" gas shocks, and they had the oil reservoir/damper assembly at the top. Some of the gas filled shocks had the dampers at the top too.
The main problem with tipping a conventional set of shocks upside down is that the oil might be expelled from the damper cylinder into the body of the shock and not return, so you'd still have spring rebound, but no damping, and essentially you'd be riding a pair of pogo sticks. (pretty much like your 35 year old OEM shocks) Cheers, Terry.