...
AdEngine supports additional ad units in the page, externally created through the googletag object in GPT. These can be Ad Manager only units, a special campaign, etc., that are not directly set in AdEngine, but can be managed by AdEngine in pairs on pair with the other units.
To add these units to AdEngine, the adngin.cmd.setGoogletagAdSlots() API function needs to be called as a part of AdEngine's functional configuration. Alternatively, it can be added using declarative configuration.
...