Protective Mat under BGE?

Greetings all - 

My BGE and Weber sit out on my composite deck. I have concerns about embers finding their way to the deck and causing damage. For now I'm hosing the deck off under the cookers prior to and sometimes during a cook so if a stray ember escapes somehow it will land on a wet surface and be extinguished. A very effective solution but hardly elegant. I'm wondering of any sort of protective mat product exists that I can put under my cookers?

Suggestions?