[Jinx]

I would like to remove the carpet on the floor and front section of the rear trunk area,
Can some pls tell me how this carpet is secured ?
Researching a clunking sound that happens going over the smallest tar strip. But not all the time. Almost sounds like a loose engine cover. Rear trunk floor sounds hollow.
Clunk is in passenger side rear. It's not a squeak or a rattle. A clunk but not a hard metal to metal clunk. Sorry for not being able to describe it better. Jinx