Smoking On A Gas Grill

I watched "License to Grill" and want to try smoking of things on my gas grill. on the show, they create "pockets Smole" (1 part of wet wood chips to 2 parts dried in the perforated aluminum foil) that you put directly on the heat source. My grill has a metal shield drive . should I take it off and put the package directly on the flame or placed on the shield drive?

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hyphy