I'll try my best to explain what I'm going to do. I'm pulling out the rear seats of my hatch and building a custom floor (same as in the pic below, taken from Rodrez). I am going to place either two 6.5s or two 6x9s behind the driver and passenger seats in custom removeable enclosures on this carpet where the rear seats would be. My questions are as follows...

1. Whats a good location with regards to speaker placement (how far behind the seats)
2. What size should I go with the 6.5s or 6x9s. I already have Alpine Type R 6x9s but was thinking of going with 6.5s if they would be better.
3. What angle should they be mounted at. Straight up like in the deck of a coupe, facing straight in towards the driver/passenger seats, facing in on an angle, or facing each other as if they were in the panels (like they come from stock/gathers).

Pic is below in case you want to reference ...