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I place mine on the left side of the cooking rack. I use a c-clamp attached to the end with the opening to elevate the open end and prevent pellets from falling out. I place the open end towards the back of the cooker.
On the right side away from the temp probe I also put a muffler clamp around the tube so the open end is about 2'' higher than the back end it seems to burn better than laying flat.