JayO92:An area two to three feet in radius around the hole should be as nearly level as possible and of uniform grade. In no case should holes be located in tricky places, or on sharp slopes where a ball can gather speed. A player above the hole should be able to stop the ball at the hole.
The R+A guide is similar though perhaps gives more scope by saying things like "effort should be made" and "stop the ball near the hole" rather than "should be" and "stop the ball at the hole". There is also the point about "if the design of the green dictates".
From Merion alone, I'd like to add to your list holes 3, 6 and 15. Though I've a suspicion that as close as 2ft most of the greens mentioned are relatively flat.
R&A: "An area of two to three feet around the hole should be as level as possible. Effort should be made to ensure that holes are not positioned within three paces of a very severe slope or ridge or of a recently used hole. If the design of the green dictates that the hole be positioned on a slope, the hole should be cut vertically, not with the slope. A player putting from above the hole should be able to stop the ball near the hole."