I have never had issues with angels and anemones - I assume because of stinging, and my clowns would never allow them to be nipped.
I have a Show Queen Angel, Changing Emperor Angel, and a Changing Passer Angel in with three RBTA,
Another tank has a Flame and until recently had a potters angel in with 5 RBTA without issues for several years,
And I had a coral beauty with RBTA for years too.