The Kensington docks that can connect multiple monitors to your PC or Mac - Tech Guide
USB-C Dock - 4K Quad Monitor - 100W PD - USB-C Docking Stations | StarTech.com United Kingdom
Targus: the world's first USB-C Universal Quad Video HD Docking Station by Jose Antunes - ProVideo Coalition
i-tec USB-C Quattro Docking Station for 4 Displays with Power Delivery 85W - 2x DisplayPort, 2x HDMI, 1x GLAN, 5x USB 3.0, 1x USB-C, 2x Jack for Audio and Microphone: Amazon.co.uk: Computers