Not critical how you do it. I was cooking some brats and filets direct on the main grill. I just tossed the pressure cooked corn on there for a few minutes to get some smoky roasty action. Brats and filets, I call that turf and turf. You all know what I say about grilling. The fire temp, dome temp etc is not important. You just want a "good hot fire". You see that with your eyes, not a thermometer. What you DO use the thermometer for is to finish the meat to your exact preffered finish temp. As far as the corn, just getting it anywhere in the KK will do. Direct, indirect no matter. On the main grill or up higher so you don't burn it. You already cooked it in the pressure cooker, just get it in the vessel long enough to get some flavor on it.