I won't go into to why's and why nots. Enough people have done that already. However, I will say that cohabitation can be done but it's not recommended for hobbyists. Zoos for instance house multiple together. Sometimes even multiple species if they are from the same local.
Pro herpetologists also will do the same. Go to youtube and look up ViperKeeper. He deal exclusives with HOTs. He's a legit scientist not a hobbyist. And zoos go to him for stuff. I've seen him do all kinds of things that the rest of us all consider taboo but I have no right to question him. I've seen him feed baby snakes just the leg of something instead of a whole animal. He knows those snakes like the back of his hand.
The bottom line is unless you know WTF you are doing don't house multi together.