Hi Alban,
Battery power is not an issue for me. I am running all monitors off a mains-powered desktop PC. I use the monitors in three different locations.
The PC HDMI output feeds an A/V receiver which feeds a large-screen TV. The ASUS MB169B* is fed from one of the USB3 ports. I did try a third monitor, and 15" VGA monitor using both the PC VGA port and a VGA to USB adapter like the ones shown on your site.
Windows would recognize the three monitors, but VGA 1024 x 768 resolution didn't match the HDMI and ASUS monitors which are both 1920x1080 so I could never find a usable setup. If I add a second ASUS instead of the VGA monitor then all three monitor resolutions will match, which should help.
Whether Windows 10 can clone (duplicate) the screen content on all three monitors is unclear to me.
Don
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