Installing new carpets

It's been a while since I started on this (lots of life issues getting in the way), but this past week I finally got back on this. For the cardboard liner I ended up using Ram Board. The contractor who was redoing our master bath used this material to protect the floors etc during his process. It was the correct thickness and water resistant so I confiscated about 10' off the roll - works great.

I have fitted all the pieces now - bit of a challenge around all the front console brackets and getting it squared up, but now letting is sit for a while to lay out flatter.

Next question is what sections should be glued down? Obviously the rear fender wells had to be and those are now glued in place, and also the rear trunk door will need to be glued as well. But for the other four pieces, rear deck, back seat back, and front and rear floors, should any of those be glued down? What have some of you done on these?