I use these car hammocks, I buy 2 and cut one up a bit & hang one from back of drivers & passenger seat headrests & let it cover floor & hang the other from rear seat headrests & let it do the same, they dont work as >hanging< hammocks with my dog because my dogs to heavy & the fixing points start to rip off, they are very, very effective once you've learned to find how best to manipulate them. At the moment they are only £5.99, buy 3 & get 50% off one of them, a great buy in my years of experience with them.
Note, I don't bother with the other 'frills, flowers & quilts' types they are just adds selling gimmicks of the same thing for almost 8 or 9 times as much
http://bit.ly/2D0MXdb