Natural host anemone for Maroons, BTA. It would not be uncommon for them to jump from species to species calling more then one anemone/anemone cluster home depending on the tank environment.
With maroons, I tend to avoid adding any other clown species. Maroons can be quite aggressive with little notice.
$.02 worth or less: Without knowing much about your tank, I might consider across species lines toward a mature pair of skunks for the carpet. IME: Skunks can be quite territorial as well, are quite adept at avoiding predatory attacks, host many anemone species in captivity, and tend to claim a spot and stay there.