Ahhh I see! It looks perfect width for the front then. It's just a shame that the outlet comes out by the lower arm. May need some careful pipe routing to get around that. You could still have it in the back and position it so its not likely to scald you in the event that it explodes
It's good to consider every option, because even if you know you won't go with that option, it may give you inspiration and lead you to the best solution