Breeding scrapes are most often found on perimeters and travel paths, seldom in the interior areas, HOWEVER, they do whatever they want, wherever they want so there are no solid rules.
Deer demographics (sounds intelligent, eh?) will also affect the number of scrapes. One very dominant buck has little need to 'advertise' his presence. A more numerous buck population means more competition and more 'advertising' in my experience.
I hunted a trophy buck 2 years in a row (never got him) who made very few scrapes.
Last year some smaller bucks had scrapes all around 3 sides of my hayfield.
Robert is also giving you good advice. I find it helps me to copy a platte map of the area and ID food plots, water, staging and bedding areas.