Deer are inherently lazy. When deer are relaxed, unharassed, and going about their usual routine, they get comfortable. They follow known, safe, trails and travel the easiest route to where they are going. Being downwind of the easiest route to their chosen food source is the best bet you've got. That being said, they get cautious when stepping out in the open. Putting your stand on the very edge of the field, I don't think, would not be as effective as placing it back where the cover is thicker.