I Am Having A App In Which First I Use Admob In It
But Now I Thinked To Change It To Start App
So I Used Extension Developed By Deep Host
What It When In Import That It Says Kodular Got Some Bug And Ask Me To Give Feedback
What When I Reopen The Site It IS Installed Their
What When I Code And Run On My Mobile It Not Show Any Ads
My Blocks Are correct As I Used It In My Test App It Works Fine
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Why don’t you try this :
It’s free and has Banner Ads as well 
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