It fits reasonably well but the sides rely on double sided tape, velcro might also be involved, neither of which I have used as i just lay the sides to the side. the back of the sheet that goes against the back seat is held by elastic around the head rests. Be warned, if you drop the back seat via the release levers in the boot, is connect the elastic first!
Whilst it is always in place in the boot, it is mainly for tip runs and moving by diving equipment so it is good for that.
I will try include pictures when I have a moment.