I have bought this [1]. It costs around 40$, does PD at 60W, 4K Display Port, 2xUSB2 (due to bandwidth restrictions - for me this is fine as I have a time machine hard Drive and a USB mic attached) and 100MBit RJ45. I also bought a 1m USB-C extension cord, which makes it possible to completely hide the dongle under my desk. No issues with any of the ports so far. I would definitely recommend looking for DP instead of HDMI, because it seems to use less bandwidth. You can also get 2 DP 4k@60Hz with PD from the same vendor.

[1] https://www.amazon.com/Cable-Matters-Multiport-DisplayPort-E...