you could put a little group until 2 of them pair up, but then you'll have to return the others as they will fight for territory if more than one pair builds up, and the other "single" rams will be forced to live in small corners of then tank
that's what hapenned to one of my female bolivian ram, but i gave her away, along with the male, and they are doing much better now, in a large cichlid tank!