I literally just got these so I can't tell how good they are in the long run but they seem ok.

https://smile.amazon.com/dp/B09VXJJNV7

FYI, you can actually lift up the headrests on the front seats and slip things in that need to hook onto headrest posts. You don't need to do that specifically for these things (you can slip the strap under the headrest gap), but you may need to if you want to install something more like this: https://www.amazon.com/Mount-Multi-Function-Foldable-Headrest-Tablet/dp/B091JKZ9Q8

Here are the instructions for removing the headrest.

https://www.youtube.com/watch?v=J4vIBNx0rBQ

When replacing the headrest, it doesn't have to go all the way back down, just far enough to hold it in AND the plastic seatback (held in place by headrest posts).