I always cook the roast potatoes during the second round of the air fryer chicken being cooked. This way your potatoes are not sat around getting cold. I always buy my whole chickens in bulk, remove the giblets and freeze them. Then I can get them out whenever I need them.
Then I get them out of the freezer the night before I plan to cook with them and whenever I can I always cook with defrosted chickens. The reason I sliced the lemon like this, is because it saved us getting out a second lemon for the sake of the juice from just one slice. The amount of rosemary you use is down to personal choice. But we found that we used one tablespoon between the chicken and the potatoes and this was sufficient.
We have found the best place to source your whole chicken to make Lemon Rosemary Chicken & Potatoes in the Air Fryer is from ButcherBox. You even receive free bacon and $10 off your first order when you sign up with this link.