It depends. A user can display video on a single-screen video wall with Screenly and a Screenly Player. To run a multi-screen video wall, a user will need to purchase a video wall controller.
A video wall controller accepts video input and splits the video across multiple screens. While we do not officially endorse the product, we have run successful tests with RIJER's RJ-MO4 video wall controller. You can purchase a RIJER's RJ-MO4 video wall controller on Amazon here. Note that video wall controllers are power-intensive, and they can become quite hot with continued use.
With Screenly and a Screenly Player, a user can send 1080p Full HD resolution video output to a video wall controller of their choice. The user needs to select a video wall controller that can work with video input from Screenly according to their needs.
To learn more about creating a video wall with Screenly, check out our article on how to make a Raspberry Pi video wall.