UMMMMM.....
I wouldn't house 4 snakes together ever....
I would get the idea out of your head now, I don't see anyone on here supporting this idea I know I don't. Why would you want to do this I don't get it? If you know they are solitary animals then why cramp there style and stress them? Any kind of competition can cause issues for the animal(s). Plus there are many options in terms of keeping a lot of snakes in a smaller area. If you have room for an 80 gallon tank then you should have room for a rack as well...
PS. Read Karote's post verrrry informative and to the point.