Making The Ads Appear In The Center Of A Post In Wordpress Based Website

According to google, the hottest spot for ads to be places in in between the content of the page. I as wondering that how can I make my post divide into two parts so that about 1/4 of it appears above and 3/4 appears below the ads placed within. Is that possible.One method is to manually enter the code of the ads in every post at position where you like but I don't want to do that. I just want these ads to appear in only single post pages automatically in the center of the content. Is it possible.

The best position might be in the middle, but that's only for the advertisement purpose, your readers won't like it, I seriously discourage you to do that.