I looked into putting two 8's in that area it can be done if the box is glassed but the face of the subs would protrude out of the space a little bit to fit correctly. I decided to put them behind the seats. Link to the thread
Install (picture heavy)
Its the first time Ive run 8's and to be honest if you want lows go with 10's or larger. I'll be changing mine up soon.