When it comes to making mock scrapes, you need to have a well thought-out plan.
Use the terrain and look for signs that tell you it is a well-used corridor. Make sure that you not only have a good tree for your stand, but that it offers the proper shooting lanes and cover to ensure you can get that shot off undetected.
North American Hunter's Gordy Krahn walks you through all the steps of not only making a mock scrape, but making a plan that maximizes your efforts. You'll thank yourself come fall.