What to put under entry way mat so it doesn’t ruin hardwood flooring?

Hi everyone! We just bought a house and this mark was left from the previous owners entry way rug 🙁

I have been using a cleaner on it, and now it looks a bit better compared to this photo. But what would you suggest putting under a rug so it doesn’t leave marks on the hardwood floor? Does a felt pad work? Some of those are anti slip, would that also cause the same issue?

I want an area rug as well and don’t want that happening either. Would love some recommendations.