Q1: Does this hub support more than 60 hz in 2k resolution ?
Yes, it's compatible with 2560*1440 @ 120Hz, 1920*1080 @ 144Hz, etc Note: to reach these refresh rate, your monitor and the HDMI-to-HDMI cable should support them as well
Q2: Can this usbc hdmi adapter be used to extend my laptop display or only to mirror it?
To use this USB C hub, the USB C port on your host device should support DP Alt Mode If yes, then it can be used to extend and mirror your host device
Q3: Hey dose it compatible with Surface Pro 7?
Yes, this USB C 4K@60Hz HDMI can work with Surface Pro 7
Q4: I can't get the HDMI port to work. What should I do?
Check if the connected USB-C port of your device supports DP Alt mode
Try another computer and another HDMI cable to determine if the problem continues
Plug your HDMI cable directly into your device and check if you are getting a stable connection. If you can't make a stable connection, the problem is your HDMI cable