We have the original hardwood floors, nicely refinished and in great condition for a 95 year old house, and almost no rugs anywhere.
So we also do anything we reasonably can to protect them.
I just use these kinds of pucks.
View attachment 120077
And put the same kind of felt pad on the bottom of them like we do for all of our furniture.
View attachment 120079
I thought about getting some less expensive Iso Acoustics style ones that would screw directly in, and might disappear visually a little more, but never got around to it.