A kind of cliqued comment on anthias is that they need to be fed frequently. While overquoted, I think this is the key to anthias husnbandry, particularly in groups. If you wantn a functional group, I think you will need to feed very frequently.
To answer the original question, I wouldnt classify any anthias as "easy to keep" in groups for just this reason. If you are willing to devote the time, effort, and resources to adequately hosue them and feed them frequently (and deal with the subsequent nutrient concerns), then, as mentioned, bartletts and lyretails are great choices. Just dont expect to get a group, treat them like damsels, and be surprised when they all die.