Sean,
On any property under 160 acres or so, the corners have to be considered, as it is almost always required to push holes as close as possible to get 18 holes on the land.
In general, it is easy to work with corners if they are high ground. Low corners, streams, etc., are hard to use for greens and tees, and you get either an awkward hole or you don't use the corner at all, at least until the land starts rising up again. Property low at all/most corners and a big hill in the middle is the hardest of all to create a good golf course.
Property dimensions are important, too. In the US, with our quarter sections, of 1320 by 1320 feet, and hole corridors of 200-300 feet wide, we have been faced with putting four wide holes or six narrow hole corridors on that piece of property (assuming only one way in and out of that parcel, requiring even numbers). Obviously, if the corners don't support tee or green locations, 4 holes is much, much better (and probably is in any case for safety and width reasons)