Help with ad implementation

Hi,

I want to add one ad to AMP content, so I have changed AMP_ARTICLE_2 position to Amp - After Block 11. But instead of the ad, it shows empty window, see here: https://tennis-infinity.com/atp-wta/how-to-become-a-tennis-player-atp-and-wta-entry-routes/amp

Other than that, I would also need help with the implementation of a new unit, for which I believe we don't have a placement in the back office.

https://docs.google.com/document/d/1azj5UuBJDtHrnnqNZS5zwtn7WkwnzKu4kaGWiZw8fzU/edit?usp=sharing

Thanks upfront.