Google dsense is used by majority of expert bloggers for their website monetization because it is a cookie based contextual advertising system that shows targeted ads relevant to the content and reader. As bloggers are paid on per click basis. They try various ad placements on the blog to increase the revenue and get maximum clicks on the ad units. To earn good revenue from Adsense it is important to place ads at right place where users having more interactions. by choose right ads placement it will boost your earnings. So to places within upper fold of blog, place below post title is always perform better than any another upper fold banners. Adsense ad units placed below the post title gets the most exposure and is the best place to put AdSense ad units to increase Click Through Rate (CTR).
How to Add Google Adsense Ads Below Blogger Post Title