Adsense which is only the highest paying ads program for blogger and webmaster. There are several policies of Adsense program that you cannot put more than 3 ad units on a particular page.
So, the placement is too necessary for high CPM and more clicks. But there are a few bloggers who are not able to add Adsense ads code anywhere on the blogger due the lack of knowledge of coding.

Full tutorial: https://bloggersng.com/how-to-add-adsense-ads-inside-blogger-blog-posts/