Not sure about your gasser , but mine has 4 burners side by side . I just used the cast iron smoker box , some chunks of apple wood , and set it over burner on the far end and just used that burner for heat to keep it just above 200F
You can see it on the left in the pic here :
Burned the wood pretty quick , but refill about 1/2 hour after the smoke stops helped keep the smoke thin and blue , not overpowering ,white and billowey :