That is not Dual Monitor
I have wanted one for years and have been unable to find anything suitable. The only option i could find were Matrix 4x2 HDMI Switches and a usb hub that i would have to manual change. Turned out that option was too expensive and messy for me.
Edit: Just had a look at prices again and i think they have gotten a little more affordable then last time i looked. You can find them now for less the $100
Hope you find an option that works for you.
Edit2: Another option could be to use 2 KVM switches or 1 KVM switch and a 2x1 HDMI switch.