Almost 80% of visitors do not visit beyond page 3 in any product listing page. How do you determine the top products in each product listing page?

Localization is the grouping of data by regional segments, analyzing them and predicting what the segment is most likely to buy for a given Search query, Recommendation or landing page. 

Visitor behaviour may not always be the same across your audience. For example in the month of September, visitors in New york when searching for dresses expect to buy Maxi Dresses or Dresses where the fabric is wool, but visitors from California might expect midi/mini dresses where the fabric is not wool. Tagalys detects these patterns, to ensure the results are unique for each segment based on their historical engagement data. 

Bear in mind most visitors will not scroll more than 3 times for any product listing page. This could be a Search results page, Category page or Landing page, hence showing the best products for that segment increases your probability of conversion. This visitor behaviour increases on mobile, where they are filled with distractions, hence whats is not on top is not on their mind.