XF 1.4 Adsense show in specific post count


Probably this question was already asked many times but i could not find a clear answer that i could put to work.

I used hook:message_below to place adsense code, but it did not work, or else it displayed after each post, going against the adsense policy.

So i would like to display one ad unit the one ad link and so on.

Does anyone know how to do this in a clear way?