If you are going to cook poultry with any other meat, the poultry must be below the other meats in the smoker. This is to keep the poultry juices from dripping on other meats.
That being said, I frown on cooking poultry with other meats in the smoker. Just a cautious approach. Plus I tend to cook poultry at a higher temp than I would other meats. That's just me though.