The difference between the out-stream unit and other types of in-content ads is that the out-stream unit has to be shown to get impressions and video ad play counted, site visitors should scroll the page to the unit placement.
The common mistake is setting an out-stream unit to the site footer. The average Impression Rate with such placement is not higher than 2%.
The best and most correct out-stream unit position is right exactly below the fold. We create visual explanation graphics for each device. Please follow these guidelines to get the most profit from your traffic:
In case you have the same template for both desktop and mobile layout, please follow the Dynamically embed guideline.