Considering where the Falcon is parked, it'd make sense to assume that there could be fighter racks along the spine. The one seen in ESB is presumably the one converted to a medical ship anyway, so I think it's fair to assume that regular ones would have an extra hangar or racks.
Some ideas:
You could make a (small) hangar on the starboard side, at about the same spot at which the medical bay is on the other side. Another place would be somewhere in the "keel" with all those mysterious cylinders. One of them could essentially be hollow, with entrances in one or two places. Finally, you could probably fit a small hangar somewhere on the front side of the back section as well. I'm sure there's plenty of places you could place a hangar without it looking wrong in any way, as the movies don't really tell us anything, and AFAIK other sources don't either.