The answer to this is: it depends! There is a lot of debate over whether meat needs to be flipped when it is in the smoker. The truth is, much of this is down to personal preference.
As a rule, the bigger the piece of meat, the more it should be flipped. With this in mind, if your chicken is a whole, large chicken, then it may need to be flipped.
The reasoning behind this is that oftentimes, larger pieces of meat will require the wood chunks to be changed, allowing you to flip the meat at the same time to ensure an even cook.
On the other hand, if your chicken is small, or if they are chicken thighs or wings, you will not need to flip them. That being said, you can flip them if you prefer to.