So I finally broke down and purchased a AR customer combo. I've done one cook so far and love its diversity. The options for cooking seem endless. Tomorow I plan in cooking a pork shoulder and was wondering where I should put my drip pan on empty shelf under the pork with my stone down below on spider? And should drip pan have liquid in it? Also when going indirect on AR do I always want stone on spider or does it matter? Thanks in advance!