It depends entirely on whether you want to shoot instinctively, or "gap." I only shoot instinctively (split finger) as it's the only way I learned how. With instinctive, there's no aiming - you look exactly at the place you want to hit - the smallest feature you can find helps, like a hole made by an arrow or a piece of dirt or something - and muscle memory, depth perception and peripheral vision all work together subconsciously to lift the bow to wherever it needs to be. This works at any distance, as you don't need to take distance into account, you just look at the target and shoot. It does of course rely on lots of practice, properly spined arrows and confidence in your equipment a fair bit.
Gap shooters (and this is just what I've been told when shooting with them) have to work out where their "pile on" is, so they know how far above the target to aim, depending on distance. If they know that their pile on is 30yrds and anywhere beyond that requires the pile to be raised somewhat, they can judge the height to adjust if they know the distance.
Some people use knuckles or elastic bands and so on as makeshift sights, but again that's not instinctive so I don't know much about it.
I can't work out how an anchor point at the corner of your eye would work at all, unless the target was about 5 inches away or something. That seems incredibly high, which would make the arrow go very low. The lower the anchor point, the more upward the bow is facing (provided your bow arm isn't moving.) Don't mess with your anchor point if it's comfortable and familiar. Just work out whether you're going to shoot instinctive or gap and start practicing. Should take you a few weeks/months probably but you'll eventually find what works and stick with it.
