I have a seat protector, so hopefully that will help protect it, and that it will be taken out a few times a week for 2 days at a time.
I have to car seats permanently in the back with seat protectors on. 2 months in and I've checked a few times with no indentations at all present. Might be too early to tell but so far so good.
My little one has also thrown up about 3 times in the back and the protectors have helped act as a tarp so I can lift it all up and out for washing.