ez plus digital signage
All you need is an Apple TV (shown in the middle of the above pic)
Multiple TVs and supporting different orientations

Multiple TVs

Control multiple TVs supporting different orientations

support for Google Slides and Google Calendars

Google Slides & Calendars

Display your Google Slide presentations and Google Calendars

Website Display digital signage

Website Snapshots

Display website snapshots, e.g. dashboards or performance metrics

Restaurant Menu digital signage

Multimedia

Display images or videos, e.g. restaurant menus or announcements 

digital signage

Scheduling

Schedule your content, e.g. different slides for different classes at school

digital signage

Curated Content

Show local weather and curated news selectable from different topics

To start, all you need is an Apple TV