Brid banner fallback has full support for display banner prebidding so you can further improve your ad performance by applying prebid logic to your banner fallbacks.
If we take a basic display banner example from prebid.org - http://prebid.org/dev-docs/examples/basic-example.html, all that you need to do inside Brid when setting up your display banner code you grab from Google Ad Manager is this:
<div id='div-1'>
<script type='text/javascript'>
googletag.cmd.push(function() {
googletag.display('div-1');
});
</script>
</div>
Make sure that the div ID matches your ad unit code in this case 'div-1' and you are good to go.