One above the breadcrumb and one below the breadcrumb.
I have two additional ads for unregistered users. One under the sidebar and one under the first post of a thread.
I'm currently using an addon to show adsense, would it be better to use XenForo's default adsense templates?
What's the best way to serve adsense without affecting page loading too much and also is it better to serve adsense via a subdomain or is that not allowed?