Quick Question, i have a clay saucer in the UDS acting as a heat spreader. My first cooking grate is at 23 inches from the fire and the saucer is between the two.. I want to add a second grate to the UDS. Should it be above the first grate or should i put it below? If i wanted to add 2 more grates making a total of 3 cooking racks, would one go below the first(at 23 inches) or would both go above the first?