It's called 'Ad Creation Control' and there IS a feature for that -
Did you know you can control how many ads each property generates?
Your choices are:
One ad for each available suite
One ad for each available suite TYPE (this one advertises the lowest rate)
Check out these options in Rentsync:
Ad Syndication > Settings (on the left side panel) > Partner Settings > Kijiji or RentBoard > Ad Creation
Make your choice and Save Settings!