Ad Units that support multiple formats are supported by Prebid.js and Prebid Server.
How precisely multiformat is supported is defined by each bid adapter on their parameter page in the “Multi Format Support” field. These are the possible values:
Bid adapters declare which formats (banner, video, and/or native) they’re ready to receive.
Bid adapters declare which formats (banner, video, and/or native) they’re ready to receive.