Last year, I brumated my entire collection(hatchlings to adults) from November to March. It doesn't hurt the animals if they are in good health. Brumating can also help with trouble feeders, saves on a feeding bill,....and of course, it prepares adults for breeding.
This year, I picked up a few ball pythons so I couldn't cool my entire building to brumate the colubrids. I am taking the extra time to grow some subadults up for breeding in 2018 if they want to eat. I have 5 snakes that went off feed once the weather outside changed. My adults are in a refrigerator for brumation to gear them up for breeding.
So it is really up to you. Since you have mixed species, the logistics of cooling can be difficult. But if you ever want to cool them separately one winter, it would be fine regardless of breeding goals...but it isn't necessary by any means.
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