The upper, left blue triangle has an opening similar to the bottom opening (yellow dashes). I mounted a circuit breaker there and it's blocking the view.
If you don't care about the jack cradle, it could be unbolted and a new mount fab'd..... the compressor should easily fit. There is a ton of room forward of the cradle but no coinvent mounting points (due to the 12v battery) for a bracket without spanning the entire space. Additionally the 4 relays would have to be relocated as they clip to the jack cradle.