Welcome, Bill! Yes, 1" below the top is great. The Auber instructions were based on placement in the Bradley smoker. I did that on my first install, and found the probe got in the way of the meat. Since the heated air is most stable at the top of the box, the 1" down position works great. Just be sure to follow the instructions and do an autotune. I see Bill hooked you up on the spacer size.