Understanding CTV Ad Formats and Interaction Capabilities in Xandr Invest and DV360

Hello everyone, What various types of ad formats are available for Connected TV (CTV) inventory when using Xandr Invest or DV360? Are interactive ads a possibility given that CTV inventory does not support VPAID? If so, what interactive elements can be incorporated and how do you measure engagement rates? Additionally, would banner ads appear as overlays when CTV inventory is chosen in Xandr Invest? Thank you for your input!