Also 1. two or more ads may not appear on the screen at the same time on a mobile screen viewpoint. 2. 300x250 or larger units are not allowed above the fold.
tangor
8:02 am on Jul 13, 2016 (gmt 0)
1. two or more ads may not appear on the screen at the same time on a mobile screen viewpoint.
Partly because of ad metrics for "viewable" payouts. Conversely, two showing will kill both as an earning point.
(Part of that is humor! Other part is don't space your ads too closely together!)