The pet liner arrived today (Sunday delivery). I haven't installed it yet. The hammock has the little black dots that go directly on your seats to stop slipping. I hope they don't discolor white seats. The door protectors are held up by 3 plastic tabs that go into the window slot. They come with this fine print warning:
Not suitable for use with aftermarket window tinting. This product may scratch window films.
The hammock does have mesh for the central console climate control! The bottom and back have thin nap microfiber on top of nylon fabric. There are slits for seat belts. The central slits are closed with Velcro and look sturdy but the ones on the sides are not. They just have an elastic band suggesting the slit stay closed. I may put an old pet liner underneath it protect the car where the slits are.
The head rest loops are fixed length. No elastic and no adjustment.
FWIW, here is the interesting side of the instruction sheet:
View attachment 719882
There is a more detailed review
here.