My ad placement is
Having a link ad 180 by 90 on the header that only shows in posts and excluding pages, categories, tags, 404 pages.
Then i have another responsive link ad on every 6th paragraph of the article and another one on the 8th
If i feel like the article is lengthy then i will place a responsive ad in between
Then at the bottom i have the matched content with ads.
I don’t have any sidebars on my blog. I have kept everything to minimal so my page load time is really fast an giving a good user experience while having ads in between