Review on 🔌 Certified Cable Matters Dual 4K 60Hz Thunderbolt 3 Dock Adapter: DisplayPort, USB 3.0, Gigabit Ethernet (Not Compatible with USB-C Ports Without Thunderbolt Logo) by James Crofton

I have 3 external monitors: curved display Dell U3415W and 2 displays Dell P2415Q 4k. I use Apple's U3415W Multiport Digital AV Adapter and this P2415Q 2 Display Adapter. I needed to connect adapters to both sides of a 15 inch Macbook. To get 3840 x 2160 @ 60Hz resolution, I had to disable MST support on both P2415Q monitors. I have macOS Mojave (10.14.3). PS: The 13-inch MacBook lacks a dedicated GPU. With this adapter I could only mirror 2 P2415Q displays on each other. PPS: Apple refuses to support DisplayPort 1.2 MST display chain, see https://medium.com/@sebvance/everything-you-need-to-know-about-macbook-pros-and-their-lack-of-displayport - mst-multistream-98ce33d64af4 . If that were the case, you could just connect a USB-C to DisplayPort cable to monitor 1, DisplayPort->DisplayPort to monitor 2.