Cargo area mat/tray for folded-down seat?

All of the cargo mats and trays I can find are for use with the rear seat erected. They leave the rear seatback vulnerable when it is folded down. Has anyone seen a cargo-area mat for use with the rear seat down? Thank you.

 

thanks for the tip! Not exactly what I had in mind, was looking for something more like a Weather Tech, but if this is what exists, maybe I have to do it.