Monetize forum site with Adsense?

I have a forum site and I need some expert to tell me where to add Adsense ads for higher CTR? It's much easier to monetize website because you can just wrap ads with text or show Adsense under some links but forum has all kinds of posts and content so where do you recommend I should place Adsense?

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Try adding Adsense to:

Header.
After on inside first post or even after a couple of posts.
Under or above reply area.

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