Quite the opposite. If you have a site with Adsense and a good chunk of mobile trafic they recommend you to install ads for mobiles and there are options to sho

Quite the opposite. If you have a site with Adsense and a good chunk of mobile trafic they recommend you to install ads for mobiles and there are options to show a banner fixed to the bottom of the screen and another to display an ad that takes all the screen. Google is really contradictory in that regard if you see what they recommend for adsense editor and what they said in the quality guidelines for search.