I purchased a plastic mat to go under my rolling desk chair because the carpet in the room made it difficult to roll the desk chair. The plastic mat has been the perfect solution. The little nubs on the back of the mat do a pretty good job of keeping it in place. Although small cups form from the chair wheels when I sit for a while they quickly disappear after I get up. I am a small person and my desk chair is a medium size so not a lot of pressure is put on the mat. I only sit in the chair for an hour or so at a stretch. The mat has been great for my purposes.
We got it home put it in place and placed the chair on it. Before I sat in it there were dents in the mat from the chair. A total waste of money. Don’t waste your time!!