How can I define the position of "Top-Priority Listing"?

If a listing activates "Top-Priority", it will be above free listings. A listing is above, which one has a more "Top-Priority". If a few listing has the same number of "Top-Priority", one will be above which this option was earlier activated. 

The more you activate have "Top-Priority", your listing is more above in your city search. You can activate "Top-Priority" and control our listing position on the Position management page.