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As part of our ongoing efforts to increase transparency around our policies, we've recently launched a policy FAQs section in our Help Center to address some of the commonly asked questions that we receive from our publishers.Google AdSense Add New Policy FAQs [adsense.blogspot.com]
Is placing a 300x250 ad unit on top of a high-end mobile optimized page considered a policy violation?
Yes, this would be considered a policy violation. This implementation would take up too much space of a high-end mobile site's first view screen with ads and provides a poor experience to users. Always try to think of the users experience on your site - this will help ensure that users continue to visit.
There's a well-known Android news site which has ads like this so I thought it would be OK.
This will be a problem with responsive Wordpress themes. If you align an ad block on the left side of the post, it will automatically move to top on smaller screens. I have an image on that position and it appears exactly between the post title and content.