Each garlic needing its own pot very much depends upon the size of the pots you are using! We always plant 3 cloves per tomato pot, and get very good crops. Whether they get a frost or not depends upon the tyfpe of garlic and so when it is likely to ripen. The leaves are good in stir fry. Even if it does not split into cloves, the bulb is perfectly useable as garlic, when we did this one year it was exceptionally strong - may have been just the type of garlic, but be aware.
It is a good pot plant, and usually gives a good full flavoured crop.