Use as air fryer

I frequently use my oven as an air fryer. Results seem to be dependent on rack position. Is there a preferred rack position for air frying? I’m trying to use recipes that were meant for traditional fryers. I typically use a flat wire basket with a drip tray below it.

I wonder if adding the drip tray alters air flow and heat patterns resulting in the bottom cooking differently than the top

Air Fry mode uses top and back heat