I would never mix females with a male except for under close supervision during mating..and even then you have to be prepared for injury. Several females is even worse..they will likely gang up on him and tear him apart...I've heard of this happening more than once in a seemingly happy community. One day they just snap. Sure you'll hear some folks say they are doing it successfully...so far anyway
IMO it is in no way worth the risk or stress to the fish.