Mark,
I would say the up and over mounds are more common to the sides of the greens, and fw to the top of the backboard behind the green is far less common, but then, I haven't seen all the courses of the world. In general, so few shots go long on the typical hole - especially with a short iron approach - that I doubt many courses would go to the expense of maintaining fw over that mound just to kick those few shots even further away from the green.
Patrick may be right that older courses in the US have more. The typical GBI course has more short grass all the way around the greens in many cases, but in the US, rough around the greens became almost standard (perhaps because of US Open setups until recently, perhaps because of cost?)
You might say ANGC no. 15 is like that, maybe not with a big mound, but I have seen Masters shots go way over and bound into the pond on 16.