Here it is all in place and set. I didn't attach it at all. I think it's thick enough that a piece this small shouldn't wander too much.

This is intended to be a temporary solution, until I can find a replacement trunk liner in salvage; At which time I'll post a new project detailing it's installation.

Had I intended this to be a permanent solution, I would have made cutouts for the spare tire and other access points in the trunk, but for a temp...We can easily lift the carpet to access the spare tire compartment if necessary.