Hey Danbo,
I use one. Normally keep the temp around -1 to -2. But I have found that if you use only one of the seperators, you can run it around 0 deg.
Just depends really on the size of your frozen stuff. I dont keep anything greater than a few steaks and snags. Have you thought about sealing the meat in air tight bags? Ive used them and they keep the meat good without having to have the temp so low.
strvy