sorry guys. not sure how I missed the questions above. Sorry about that!
Yes, I get three per rack. They touch, but I haven't found it to be a problem. The way I see it, the only real problem with them touching is that the skin doesn't get browned or crisp in the spot where they touch. But since I'm not carving and presenting them at the table whole, it doesn't seem to be any problem. Also, after cooking they do shrink a bit, so by the end, they are only barely touching if at all. Just arrange them for the most optimal fit and you'll find it isn't so hard to do.
Also, I haven't found there to be any problems caused by reducing airflow by stacking the chickens close together. I cook on high heat (350) and the minimal touching doesn't seem to change the cook time or the evenness of the cook. I've had very favorable results.
Oh, and size... they are usually 3.5 to 4 pounders. They certainly aren't big old 5-6 pounders.
Hope that helps!
- Adam