In general, I don't think two males and one female would be good. Over mating, aggression, stress and so on. But there might be special cases. And for the plastic storage bin.. If it works for two, I guess it'll work for 3, but keep an eye out for any aggression. About the pair/trio/group thing, I have never had pairs, so all I can say is that my male+3 hens = 26 chicks (I'm counting chicks out-of-the-egg here, not chicks surviving to adulthood) in 6 months. Guess I'll have to buy some roos so I can place at least one of my female chicks alone with a roo, so I can see for myself whether it's better or worse than groups ^^
I was actually at a bird exhibition today, though. There were 3 cages with buttons. One with a lone roo, one with a roo and hen of some special color - very pretty by the way, they almost looked wild colored but some of the usually very dark feathers on top of their heads and backs were a light yellowish-brown - and one with a roo, a hen and a few almost-grown chicks. I noticed that the hen in that cage had very ruffled feathers on her lower back and my conclusion was it was probably from over mating.
Based on my current knowledge on the matter, I think it is very individual from bird to bird, what works. Some roos might not be suited for just one hen (some would say such a roo shouldn't be bred), some hens might not be suited for groups..
Right now I have the parent group, a group of 3 roos that are about 4 months old, a group consisting of their two sisters, and a group of 6 roos and 7 hens that are about 8 weeks old - those are almost sexually mature, so I really need to separate them to prevent the roos from fighting over the hens.. It's turning into a button quail farm! I only managed to sell two roos this far. I might end up giving most of them away, as I really can't accommodate that many birds.. But that's a different topic ^^