Now you have me thinking I installed mine incorrectly. Like others have stated there is a screw on the passenger side but on the driver side it sits up slightly. Still below the front end air holes but it sits slightly up. This morning despite the cold because it was bugging me I took off the tray and the cone to see if I could adjust it. I cant see a way where it could go beneath the piece that it is sitting on. Especially with the raised lip in the middle. It seems to be in there fine as it should? I took some pics and a video.
This is where my finder is touching the pad I put down to stop the rattle
Video