AdSense for a mobile webApp, disapproved due to "Insufficient Content"
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My AdSense account was disapproved due to insufficient content. I need to insert adSense banners on top of my mobile webApps (like native adMob). 

WebApp is allocated on our server and is composed mainly for an iframe. For example, our website "www.mywebsite.com" have allocated a web app on "www.mywebsite.com/myuser/myfirstapp". 

Then, "www.mywebsite.com" is full filled with content but I must show banners only on web app link, however, this is only composed by an iframe. 
How could it be done? I don't mind to use same adSense for all users webApp applications. Which are best practices to reach it? Thank you for supporting us.