The Optimization tab
AdSense Lab: Inline ads
Inline ads are 320x100 ads that AdSense can automatically place on your mobile pages without you needing to specify an exact location.
|Some important things to know about inline ads:
How to implement inline ads
Inline ads belong to the Page-level ads family. To show inline ads, your pages need to have Page-level ad code on them. If you haven't already, you can follow these instructions to set up Page-level ads.