When you download and install “Rank Addon” new section will be added to the Addons tab of Listdom -> Settings and you can configure this addon.
First of all, you can define how much having “Featured Image” and “Gallery Image” will have a positive score for listings.
After that you can set Rank value for each Category, Label, Feature and tag. For example you set 100 Rank for a category when a listing adds to that category it will take that rank.
So the listings that have more Rank will show higher than other listings.
Note: please use ranks more than 1000.
Another effect that Rank Addon has is showing the Default Sort option in front end that order based on listing ranks.