They need to be mounted a fair bit away from the mid range, but it could be difficult to find suitable spot.
However, there ARE 2 nice Vents either side of the parcel shelf area. If you could mount them inside the boot in this area, it would look pretty trick. As long as wiring is tidy. not sure how itd sound though or if the bass would simply elimnate them.
Do u know the easiest way to gain access to the rear speakers I had a quick look an aint got a clue!