Plugable 4x HDMI Multi Monitor Adapter, USB 3.0 or USB C to HDMI Adapter | eBay
MuxLab 4x HDMI Output Card for 500470 Martix Switch 500475-SA
NovaStar H Series 4x HDMI Input Card - NovaStar LED
LG 43MU79-B: 43'' IPS UHD 4K Monitor (3840x2160) with USB Type-C™,10W Speakers, 4x HDMI Inputs, HDCP 2.2 Compatible with Remote | LG USA Business
Sprolink Neolive R2 Multi-cameras 4x Hdmi Inputs Mixer Switcher With Usb 3.0 Video Capture Live Stream Apps - Auxiliary Devices - AliExpress
SPROLINK NEOLIVE R2 Video Mixer Switcher 4x HDMI-compatibleI Inputs with USB 3.0 Video Capture Live Streaming _ - AliExpress Mobile
Amazon.com: StarTech.com USB 3.0 to 4x HDMI Adapter - External Video & Graphics Card - USB Type-A to Quad HDMI Display Adapter Dongle - 1080p 60Hz - Multi Monitor USB A to
4XEM 6-in-1 4 HDMI port USB-C Dock
Midwest Photo Atomos AtomX CAST 4x HDMI Switching & Streaming Dock for Ninja V/V+
HDMI QAM Modulator IP - 4 Channel HDMI QAM Modulator