@ratkat i have three car seats in the back and have tried those covers... it's so discombobulated with the free flowing fabric, even with weights on the bottom, that I found it too distracting and the fabric moves too much / isn't a great fit
@boomyboom honestly, no, they held in place surprisingly well with 3 kids and 2 dogs during multiple 2 hour trips. i'm sure the structure of the mat will loosen over time, but i could cut holes in the mats and better secure them with the bungie cord. barely any hair so i was very pleased. i'll keep my eye out for a slightly larger, stiffer mat than the lowes black hawk, but in my mind as of now problem solved.