Probe Placement for box temp?

My probe came with a grill clip (hung between 2 wires of the grill) and I soon lost it, so now I use a 1/4 chunk of wood. The hole is loose enough to allow easy sliding of the probe, and I let it stick out 1 inch beyond the wood. The other day I did some ribs and the end of the probe was only out 1/8 inch at best and the readings were off!

I figured using wood was easy, when it got too gunky (technical term) I could throw it in for burning and use another.

I also place it on the same level as the food I'm smoking, or in between if using more than 1 rack.

Yea mine came with a clip that goes into my racks. I have used a wood chunk several times when I couldn't fine my clip and they work well to.