Dynamat questions

So, I got a deal on a box of Dynamat, 9 sheets 12"x32". Now I'm wondering how best to get the most out of those 9 sheets. I'm not sure if I have enough for full floor coverage. Not that that's always the best plan. Any suggestions as to placement for maximum results? I'm already thinking I'm going to use some above the headliner, as the roof has a real hollow 'ring' to it.
Anybody have any ideas, or better yet, pictures?