honestly, you'd have to have a lot of air time to spot after the first flip.  I know that when I do doubles on the tramp I'm spinning so quick I can just feel where I am in the air and don't need to look until it's time to put the landing gear down.  With my dub backs, I just set it and keep looking back, it all happens so fast that I don't really remember what I see when I'm upside down, but as I open up from my second flip I spot my landing then.