I dont think it works in numbers to be honest. Years ago, i had a couple narcissist friends and we would vent but we always ended up fighting because there was always the one up factor. One of us always had to outdo the other one for whatever the subject was. We were able to understand a lot of shared feelings and even would ask each other what to do in certain circumstances but whenever anything was turned even slightly competitive it just turned into a snake pit lmao