I have used DisplayLink [0] to connect M1 to two monitors via DP and worked well. It not fully plug and play, I had to install displaylink software.
However I noticed that if I connect the other port to charger it would (sometimes) add some latency to running apps (for example safari might not respond immediately or vscode will take few seconds to load).
[0] WAVLINK USB C Laptop Universal Docking Station 5K (up to 5120x2880@60Hz) / Dual 4K Ultra HD video, 2x HDMI and DisplayPort, 6xUSB3.0, Gigabit Ethernet, Audio, Mic, Supports Windows, XP, Mac https://smile.amazon.co.uk/dp/B082SR6GMB/
DisplayLink (as it's name might suggest) has nothing to do with DisplayPort. DisplayLink runs a compressed video stream over host USB to an external box (which decodes that compressed stream and pipes it to the dual DP ports on the box).
I read bad things about getting Thunderbolt working properly with Linux so bought a DisplayLink port extender (Lenovo) and it was an awful experience. Janky, didn't support the later kernel versions, didn't have a RPM or Fedora repo, crashed a few times a week. Awful.
Since then I've also bought a TB one and it works flawlessly. The DL one sits on my desk at work as a glorified charger now.
[0] WAVLINK USB C Laptop Universal Docking Station 5K (up to 5120x2880@60Hz) / Dual 4K Ultra HD video, 2x HDMI and DisplayPort, 6xUSB3.0, Gigabit Ethernet, Audio, Mic, Supports Windows, XP, Mac https://smile.amazon.co.uk/dp/B082SR6GMB/