I would house them separately, IMO. That way, you can keep better track of each one of them individually. If one gets sick, you may have a hard time pinpointing the cause. Also, it could get spread very easily if all are the in same cage and then you may not be able to find out WHO was sick first, and why, etc., etc..
Also, feeding accidents can happen. One friend of mine had his female hognose eat the male she had been breeding with for years. It was an incident that happened out of nowhere one evening. He had kept them housed together. Also, another friend of mine had a San Diego gopher eat another one when he was cleaning cages and getting cages ready and had put some together for a few minutes.
There is always the chance that if one snake smells food on another, a feeding accident can happen. It is not worth the risk.
Take care!
Billy
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Genesis 1:1