Yeah, try turning it over but if the is no way for the fan to draw air (ie it sits on the floor of the case) then don't try it the PSU will overheat and Die
You could always cut a blow hole (will in this case an intake) under the PSU so the fan could draw air in from outside the case but buying some extensions would certainly be easier
Talking of extension cables the Akasa ones are longer (and sleeved) which may be of benefit as you could hid the connections behind the motherboard tray and still have plenty of cable to get to the connector (especially the 4pin).