Best thing I ever did was substitute water for lava rocks. Foiled the pan multiple times to prevent scratching.
Put 2kg lava rocks in then foiled multiple times to catch drips. Only did 2kg to leave space for foil to create a drip bowl.
Temp control was unreal.
Running Pro Q Ranger. Smallest one but just fits a 3.5kg bone in pork shoulder.
Larger models will take 3kg lava rocks.