You are correct on the height. I had a mess of chicken to cook and needed space. Also, since there is no heat under zone 4, you have to flip food to evenly cook both sides. The rack sits on top of the other grate and is supported on the left by the ledge and on the right by the lower grate. I even cooked a 15# Turkey on it without issue. I'll post a picture as soon as I figure out how to do that on this new platform.