Does Hotspot work with the Microsoft Surface Pro 3?

Yes. Connectify Hotspot 27 works with the Surface 3, Surface Pro 3, Surface Pro 4 and newer Surface devices that have a 64-bit Intel or AMD processor. To run it, you will need to be running 64-bit Windows 10 version 1703 (the Creators Update) or later, or Windows 11.

Surface devices with an ARM (Snapdragon) processor, such as the Surface Pro X, can't run Connectify Hotspot. See PCs that can't host a hotspot and What Operating Systems does Connectify Support?