I've cooked 6 (3 on top and 3 on bottom) in my 18.5, so I'd have to believe you could fit at least 2 (1 on top / 1 on bottom) and probably more
I got my stands at Home Depot, but I had to dent the bottom where the can goes, because I mostly use Coors Light, and the skinny can slid through the stand. The dent stopped that