In the famous Google AdSense heat map are reported the most profitable areas where to put advertising for your site or blog.
There is no mention of a placement in the middle of your posts. Why?
Because by default Blogger, the blogging platform offered by Google, doesn’t offer a way to break a post in the middle and put there an ad.
But, if you search very carefully on the Net, you’ll find that several webmasters tried to put ads in that position and report a significant increase in profits.
This site doesn’t confirm an increase in profits when an ad is in the middle of a post, but explains how to put AdSense in the middle of a Blogger post.
Yes its true that these heatmaps are reported to be one of the best option. This tool will guide where to place ads so as to increase profits. I will surely take care of all the things you have mentioned.
heat map