Entrance reducer notch up or notch down — and does the small opening go in the middle or the corner?

Minnesota first-year, two hives, and I have a truly small question that I've now seen argued three different ways online. My wooden entrance reducers have two notches, a big and a small, and I'm about to go down to the small one for fall. Some people say notch DOWN so it's a normal walk-in doorway and the bees can drag dead bees out. Others say notch UP for winter so the opening doesn't get blocked by dead bees piling up on the bottom board when the colony can't clean. And then there's whether the opening should be in the middle of the front, near where the cluster is, or pushed into one corner. I've seen "corner, so a guard can hold it" and "middle, so the cluster is nearest the air" both stated like facts. I'm going to mouse guard over the top of whatever I do. Is there an actual right answer, or is this one of those things where everybody's fine and nobody admits it?