No, the displays don't need a Thunderbolt controller (and I do get 3 separate displays - mirroring would be pretty useless, I agree). I use this dock: https://

No, the displays don't need a Thunderbolt controller (and I do get 3 separate displays - mirroring would be pretty useless, I agree). I use this dock: https://www.amazon.com/Lenovo-Thinkpad-Thunderbolt-Dock-40AC0135US/dp/B071NWZDJB https://www.amazon.com/Lenovo-Thinkpad-Thunderbolt-Dock-40AC... After updating the dock to the latest firmware, I can run two 4k60 displays, although it requires a specific configuration: one display on one of the DisplayPort lanes, and one on an active USB-C to DisplayPort cable hooked up to the dock's unpowered Thunderbolt port. I've done this setup multiple times with this dock model, and it has worked with every Thunderbolt 3 MBP I've used.