Mine don't move at all. They snap in to the pegs on the floor and stay put.
Like the previous poster, I've had weathertech's in a lot of my previous vehicles but decided on the Maxx's because the offer much more coverage.
Both the fronts and the second/third row Maxliners lock into place so they can't slide. I do not have the rear one, as I usually have an old blanket used for that purpose for those dirty items that may end up back there.