The connectivity-equipment maker Cable Matters has released a new docking station that can expand a MacBook Pro's output by up to 2x 4K at 60Hz via HDMI. This Dual-Input USB-C accessory can also support 80W Power Delivery (PD) charging and read microSD/UHS-II SD cards. It is available at US$189.99 per docking station.
https://www.notebookcheck.net/Cable-Matters-offers-a-dock-that-can-drive-2-4K-60Hz-monitors-with-a-MacBook-Pro-for-under-US-200.423809.0.html