Neither of those are really very good ideas though. You want the filter media covering the entire back of the booth, with the fan sitting a bit behind the filter media to create a vacuum chamber between the fan and filter. That way the intake draw pulls from the entire opening of the booth...
I have a spray booth, but I won't use canned paint in it. I do that outside. But booths are great for airbrush work. Mine is small, but I do mostly small scale painting. It won't really fit the bigger 1/10 bodies in it, but does OK for anything up to true 1/10 scale bodies, like Tamiya or Kyosho...