Backyard Basics Northwestern Grill Mat

I just ordered several of these and as soon as I looked at the box and saw all the detailed information on how 'not' to use this I packed it up and got a free return shipping label from Amazon and shipped them back. It says you cannot use this product with a charcoal grill as the sparks and coal will cause it to melt. I am wondering if it would even start on fire? It says it may discolor your deck and to please move it often. Also the vynol material reminds me of the kind of vynol they use for a cape in a Halloween costume. This was not at all what I expected. I guess I expected a mat made out of old tires, something that was thick and durable and would withstand the outdoor elements as well as the weight and heat of the grill.