Indeed the Wavlink adapter works, plug and play, no driver to install.
Below is an image which shows that my entry level cheapo gaming Acer Nitro 5 is able to be connected to 2 external monitors – (a) HDMI to the Acer Nitro monitor and (b) with Wavlink USB 3.0 to HDMI adapter to my Philips monitor.
If you are just surfing the internet or performing some simple image editing, the above combination using the Wavlink USB to HDMI to connect to another external monitor is great.
HOWEVER, when I have the second monitor connected to my Acer Nitro 5 using the Wavlink USB to HDMI, there is a lag when watching video regardless which external monitor I am watching the movie on. Therefore when I am watching videos, I will unplug the Wavlink adapter from my Acer Nitro 5.
Like I said, my Acer Nitro 5 is an Entry Level set and maybe the graphics card that came with my notebook cannot handle 3 monitors (when watching video) and maybe that is also why it only comes with 1 HDMI port.