WELCOME to the board, pleasure to have you among us. Be prepared for an interesting dialogue. I'm sure there's an opinion for everyone who reads this thread.
I would look at putting it right at the rear swim step storage
compartment. I assume you have a DS model, not the CC model. Either way, mount it on some really good vibration isolation mounts and toward the rear. In one of those compartments (water tight) you can easily create some outboard ports
and venting which would remain watertight while not in use. Also, out of sight, out of mind. Hanging on the back would certainly invite an unwelcome user who wouldn't bring it back. LoL
If you choose to put it inside, just to the side of the entryway yu may have room like this...