guggi2000 - 4:11 pm on Apr 18, 2013 (gmt 0)
I got a response from Google Adsense. Please note that everybody may get a different response and you have to contact them directly to get approval.
"...What about other ad-networks that suggest that I place my Adsense code in their fall back option so that my Adsense ads would show as the default?"
A: "...that would be fine ... as long as you are staying within the limit of 3 ads per page"