Great topic.....
I struggle to design just such a thing. I know JN used to put small mounds just in front of the center of the green to defend that pin spot, at least sometimes. John Fought did it some, too.
Tiers, or center depressions work, too. 13 at Indian Creek has a big valley coming off the front center of the green and putting the pin right behind it makes for an interesting shot. I have contemplated, but never really done a green like that where the back center also falls away to make a real small pin area.