Where to put my 10 inch subs?

I currently drive an 05 Ford Mustang. I want to buy two 10 inch subs but the deep ones. Will they be able to fit underneath my seats in the back or am I just better off setting them in the trunk?

Since when was there any space under the back seat in a mustang?

Subs will go in the trunk.

A capable 10" will probably require a cubic foot or so of airspace per sub so you'll need quite a bit of space.

Have you actually seen a pair of deep subs installed in cabinets? Have you even bothered to look at your back seat? This is like saying that you want to get two pet African elephants and keep them in your bathroom. Comprende?