Review on StarTech.com Dual DisplayPort 1.2 MST Hub - 2-Port Multi Monitor Adapter for Extended Desktop Mode - Supports Dual 4K 30Hz or 1080p - USB Bus Powered - Windows PC Compatible - DP to 2x DP (MSTDP122DP) by Larry Morris

I don't know what some of the negative reviews mean but they made me skeptical about buying. Those who say "3 monitors are not supported" will only support what your graphics card supports. Of course, if your graphics card supports 2 displays at most, you cannot use it for 3 displays. Won't turn off, won't turn off etc and looks like it should. Power 3 monitors over HDMI as we speak. It's a bit pricey but seems well made. It looks like cheap plastic in the pictures, but it actually looks more like high quality aluminum and feels solid. I'll update my review if anything changes or goes wrong, but I'd suggest trying it - do your research first!