Hi, JDB
Please see below for a list of issues with using a Windows PC as a signage device.
■Device: When we contacted Zoom, they recommended Corei7 to take full advantage of Rooms' functions, but a Celeron N4000 or higher CPU will work fine, although Rooms does play videos, still images, URLs, and view webinars. Within that range, a Celeron N4000 or higher will work fine.
Fanless is good for quietness.
For example, we use the PC linked below.
Amazon.co.jp: Mini PC, Quieter2Q Celeron J4125, 8GB Memory, 128GB eMMC Processor, Windows 11 Pro, Hi...
■ Update: If you connect to the Internet via WiFi, you may want to turn off "Automatically install Windows updates" and register from the Device Management menu so that updates are limited to critical patches. This is because Windows updates frequently and WiFi connections are often lost after an update.
■Autologon: In some cases, the automatic logon setting does not follow the Zoom manual. In such cases, you can use the application provided by Microsoft for automatic logon settings.
Autologon - Windows Sysinternals | Microsoft Docs