Vertical MS Surface Dock for Your Monitor
So you would like to use your Microsoft Surface tablet as a secondary display next to your monitor? The Vertical MS Surface Dock has you covered. It holds your Surface at eye-level and reduces clutter on your desk. It uses 100mm VESA mounting option.
The design is open source, so you can make parts for yourself. You are going to need a dual VESA arm to mount the monitor and dock.