idk, I guess it depends upon how you're used to viewing the tables. I can comfortably put a half dozen on my laptop screen (and 9 would be okay) with Fulltilt. I just tile them but am used to viewing small tables. Other sites like Titan, not so great.
I think stacking them is the way to go if you plan on playing alot of tables - having the screen quartered and then mulitiple tables stacked upon one another.