I would definitely NOT just throw them in a very cold environment like that all at once. Additionally, refrigerators usually stay too cold for brumating snakes. They tend to only get into the mid-high forties or so.
A wine cooler is much better at dialing in the preferred higher temps you will want to target(mid-to upper 50's or so), depending what types of snake's you will be brumating. These can be bought for a couple hundred bucks, and work great when setup correctly.
My friend "JKruse", and "Upscale" over on the kingsnake forum have used these very successfully in the past, and Jerry has proven good results in short order with his that he just recently acquired for his Mountain kings(zonata) this year.
I would go over to the king forum and post about what they could tell you about their experiences using a wine cooler so you know how to deal with it without finding out something the hard way and jeopardizing any snake's health. Jerry just posted some good eggs over there from some snake's that were introduced into his wine cooler this season.
good luck!, ~Doug
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"a snake in the grass is a GOOD thing" 
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