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Use of pizza stone in gas oven

I have a new gas kitchen stove. The oven seems to burn so easily. I have a thermometer in there and it is registering the temp that I have the oven set on. I have seen where people have used a pizza stone to even out the heat. I want to know if you place a rectangle pizza stone directly on the bottom of the oven or should it be placed on a rack on the lowest setting? I would appreciate replies from anyone who has used this and if it had helped the problem