I added only 1/2 tsp cumin powder as my family is cumin-averse (I really don't know why!!!) so the taste was slightly different. Adding the full cumin quantity would give a more tandoori flavor!
You can grill the chicken as per your normal setting as well. My oven has a specific setting for chicken, which I use for cooking my chicken.
Instead of whole chicken, you can use chicken pieces or boneless chicken as well. Adjust cooking time accordingly.