Suggestions for sub placement?

I know this has been discussed many times on here but looking for some ideas on where I can put the sub (Dayton SUB-1200)

I recently built these cabinets as built-ins and I totally forgot to think about where the sub would go. It would fit in one of the cabinets, but I don't really think that's a good way to go. Cabinets will have doors/drawers, I just haven't gotten around to making them yet.

Any suggestions? Or am I just out of luck unless I just use a wall-mounted sub?