Like some of the posters above, I would still play Carnoustie. We played off the mats in April and it was fine. If you are off the fairway, no mats are required, and even if you are on the fairway, if you are near the edge you can move it over into the rough (which, admittedly was sparse when I was there, which may not be the case for you). I hit about 9 fairways at Carnoustie, 3 or 4 of which were near the edge and I moved them into the rough anyway. I really only hit 5 or 6 full iron shots off the mats. Not a problem at all, really