I am in the process of building a website that will be my first adsense site.

The site - Niche Website 101

It's already been approved and I've started ad placement on some pages (although the content is complete as of yet). I just read something about placing the ad blocks to close to navigation and am curious if anyone who has experience with adsense would think the placement of the box unit under the second nav could be problematic. It is formated completely different, different color, layout, font-face and what not, but I'm not sure that is enough ...thoughts?