Well I have 2 together, male and female, but I know 3 would be a sure fight. I just got a new Parakeet, and her cage is beside the Parrotlets, my male got all fluffed up he is very angry. I know he would attack her if he could get to her. I would say no, a firm no.
Nellie, hatched Dec 3 2019
Noah, hatched in Jan 2020,, both American Turquoise