10's wont fit into those "nooks" very well. There is only a very small handful of 10" 's I've run across over the years that require a box small enough to fit into those areas in the way you'd like them to fit. Probably, perhaps 4 different ones, two of them you'll probably never find again as they were rare to begin with, and that their from 1993'ish.
They are ways of using a very unique box design called "Dipolar" but thats very very techincal, and requires advanced electronics to get the sub to reproduce the sound in a manner that works with the box design.
Subwoofer design
^ I know you wont read up on any of that, but thats it in a nutshell. Basically, you dont really need a functioning box to get bass. Its a marvelous concept, and would work great if you were hell-bent on 10 or 12" 's, all the while didn't want to use up anymore space then what you want to be available.
Digital Designs makes some fantastic (now discountinued) 8" subs that will definately blow you away SPL and SQ wise. They take a miniscule box, of perhaps .3-.8 cubic feet. Thats less then most 6" subs.
