LOS Question from Hill

[saracv3]

What would the highest point of a pancake hill be? Also, I’ve always wondered what the LOS is on a pancake hill to a lower elevation such as a valley? Is there a blind hex? For example, assuming a unit sits in the middle of a hill where there are two or more flat hexes and then a slope or cliff, is there a hex in the valley or lower elevation that can not be seen such as a hex that is closer to the slope or cliff?