It's not an H80 it's just a 50 (the 80 has a square water block, mines an older model 50 anyways) and ya it's upside down it was the only way it would install without kinking the hoses. Id have put it at the top but my motherboard is so close to the case edge there isn't enough room for push/pull. Also it's in the orientation that's shown to keep the hoses out of my top fans.
Tops as intake with the 50 exhausting, positive pressure setup? Could work, but ya I'd need some filters my room gets dusty. I could re-seat it the proper way up and stick the rad at the bottom next to the PSU. Not sure the hoses would be long enough thou.