Pizza Stones & RV Ovens

In past years I've read about the usefulness of pizza stones in RV ovens to help disperse the heat and provide for better baking results. In fact, we purchased one about 4 years ago and waited to use it for 3 years. Finally we did, but I failed to place it on top of the oven rack, using it instead on top of the bottom, right above the heat source. It cracked into 4 pieces with a loud noise.

Now that we've understood the proper placement of the stone I've been looking for another one that will fit our RV oven which is about 15" X 15". Actually it's a tad over 15", but not much. I've found a 14.75" at Bed, Bath, & Beyond, but before purchasing it I wondered if anyone has any thoughts/experiences with the proper size of the stone based upon the size of their oven.