Just tried it with two external monitors. Worked great, no problems. I had both external monitors and the built-in display running, with the display “extended” to all monitors. All were running at native resolution and refresh rate (laptop 2560x1600-165Hz, external monitor 1 at 3840x2160-60Hz, external monitor two at 1920x1200-60Hz). No additional power required for the hub/dock.
Again, FW 16, running Windows (latest BIOS and driver package), using the Anker 556 USB 4 hub. The hub was connected to the laptop with the included USB C cable (USB 4 speed rated).