I was given a Weber poultry roaster which works well and eliminates the risk of the bird falling over.
The porcelain coated (non stick) base catches the juices so there's no mess and is perfect for gravy/sauces.
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For best results, season the chicken with a rub, inside & out, as Roadster says.
Cajun chicken is delicious.
It also works well for smoked chicken if you have a 22.5" grill.