Product review (5 stars): A great find!
As of the first day we love them!  After reading reviews of similar products on Amazon the McClure's silicone seemed to be the clear winner.  It's absolutely true that they don't slide around, they fit well, they look great and they're a HUGE improvement over the crushed aluminum foil that we used to squeeze in the gap between the stove and the counter.  It was helpful to be reminded in one of the comments to have the narrow edge on the inside, toward the burners, and the wide side on the counter.