DV360

To add the AdaptMX's Display+ pixel, please refer to the below DV360 docs.
https://support.google.com/displayvideo/answer/6248876?hl=en

Enter the provided HTML tag (contact your AdaptMX account manager for the tag) into the "Append Tracking tag" field. If there is an existing HTML tracking tag, our HTML tag can be safely appended to the end of the existing HTML tag after a line break (as below).