It's not that simple at all. There should be flexibility, especially if it's meant to plug into monitors as a pc replacement! I'm yet to come across a monitor with hdmi on it and having just kitted out a building I've seen a lot of them. I'm not saying they don't exist, however if this is to be a convenient solution then it should work with digital input not just one specific port.
Another thing to note - every single time I've ever plugged it into a standard TV the display has been grainy and the icons are off screen as if the screen is cropped. So it doesn't work well on TVs, it won't work on monitors...from my experience I am sure you can understand why I am saying that this is far, far from ready for daily use.
I will be trying the hauwei one at some point hoping they have more flexibility in theirs. I've given up with Dex sadly.