I connected my AW3418DW monitor (3440×1440, 120Hz) via DP (with an adapter in the extra USB C connector), an other 24” 1080p monitor via the HDMI Port, Ethernet, Keyboard & Mouse and power. All works with no issue, no setup and over a single cable to my MacBook Pro 2017.
https://www.amazon.com/Certified-Cable-Matters-Thunderbolt-Compatible/dp/B074G4X7CL

