This article will help setting up PMP's to work with Adnami high impact formats without having to put code on page.
1) Deal in SSP
Create a deal in your Prebid SSP exchange e.g. Xandr, IX, Magnite etc. and choose the placements / ad units which needs to render the Adnami creative and make sure to choose the size of 1x2 if the Adnami creative format is e.g. Topscroll.
2) Prebid ad unit
Add the size of 1x2 to the existing GAM* ad unit of which the Adnami creative needs to render (see image below). Make sure that SafeFrame is disabled in this setup (see image below). Creative size needs to be one that is not already in prebid line item setup. One deal per format.
*This only works in Prebid.org with GAM line item setup. Not in Google Exchange Bidding.
3) Wins bid
The deal in the Prebid SSP wins the auction (should be often since the bid price for Adnami formats is typically higher than standard deals).
4) Activates prebid ad unit
The winning bid activates the prebid line item in GAM which has creative SafeFrame disabled and therefore it can expand out of the SafeFrame due to certification from the Adnami team.
5) Ready to go live in LITE enabler mode
The publisher is now ready to sell Adnami formats programmatically with LITE certification.