9x1 4K HDMI Seamless Switcher w/ Multi-View | A-NeuVideo, Inc.
XQ-CEA-0161US, 4K HDMI Multi-Viewer, 4 in 1 Out HDMI Screen Switch with 5 Modes, Support 4K@30Hz/2K@60Hz Seamless Switch for Game Studio, Exhibition Hall, Video Meeting, Surveillance, Display Mall etc., Iseebiz
4x1 4K HDMI Quad MultiViewer with Rotation and Audio : Avenview
4K 8x1 Multi Viewer HDMI Switcher Switch Quad Multiviewer Screen Video Converter | eBay