This unit will appear at the end of your sidebar. As the user scrolls past the end of the sidebar, it will stick to the top of the screen and auto-refresh every 30 seconds.
The key to this unit’s performance is a short sidebar + long content so that as the user scrolls down through your content, it will stay with them for a good long while. This leads to higher viewability, which leads to much higher CPMs.
That means a shorter sidebar + longer content = more money for you.
There is one exception to this rule:
If you are utilizing the Optimize Ads for Desktop Pagespeed feature, you may want to place a sidebar widget (or two short widgets) at the top of the sidebar that will effectively push the first ad "below the fold" and out of the first screenview. Read more about that here.
Please remember that if you make changes to your sidebar, you will need to reach out to email@example.com to have your ads re-targeted.