Yes, I am just holding it in the picture. Ozzbros suggests that the bed extender is a handy way to hold it up. It does not attach in any way to the truck except when locked. you could just put a prop of some kind in the bed if you wanted. The upside is that there's nearly nothing to mount to install it and it comes off instantly when you want to carry something big.
My wife brings a lot of shrubs and plants home and a lid that had to be de-installed to do so would be a big problem for her.