Pretty straightforward question folks. If i buy this game on GOG can i share with 2 of my friends so we can all play together? (2 gaming laptops, one pc, the sharing refers to the setup .exe and by playing together i mean multiplayer over the internet)

I regularly play with my brother. I have watched multiple live streams of 3 - 4 people playing together.

Here is a video explaining how to set up your game for multiplayer. (It shows Steam but GOG works the same way.)

https://www.youtube.com/watch?v=7vMtwGhjsZI

I think, emphasis on think, you must all be signed into GOG Galaxy Client to play together. I have never tried to do multiplayer with someone on another platform.