We now support casting to multiple displays simultaneously. For more information, refer to our blog post here.1. Connect each display to its own Chromecast. Ie: If you have 3 displays, you'll need 3 Chromecasts.2. Through the Google Home app, connect each Chromecast to your mobile device. To do this, make sure you're on the same Wi-Fi network.3. Once setup is complete, go to the Signboards or Slideshows tab. Choose one and hit 'Cast.'4. A list of available displays will appear. Tap the display you wish to cast to.5. Go back to Signboards/Slideshows and cast another. Repeat until all displays are running Promota.