[Cool_V_300C]

you'll be fine without the expanding foam. you could use the
minimal expanding foam to avoid denting your trunk. I did
this back when I had a grand prix and worked out good. So
if you still want to use expanding foam, only use the minimal
type.

But I only have sound deadener. The carpet doesn't cover
the whole thing and I only put it under the cover.

I'll post a pic later.