If you limit it to just Rs you may not get enough cars. While I was at Charlotte several people came up to me and ask if it was a real R and then couldn’t believe I was tracking my R. I’m not sure how many of us track our cars still so we may not get a lot of cars for track.
However another world class track is COTA.
A KC car club goes down to COTA every spring for a weekend. I haven't been before, but plan on going this coming year.