Output results

Good day! Thank you for the great plugin. But for me, as a beginner, there was a problem. The plugin allows you to sort by the Meta key. I use it. But as in the derivation of the results highlight the first 3 records. To make this look like a “TOP -3”. I tried to do it through the database. But I can not understand what kind of variable units responsible for id post. Please tell me how to select records that will be in my TOP.

https://www.ads-software.com/plugins/ajax-wp-query-search-filter/