Dear TonyR, I know about BI geofencing feature but we are 4 so we need to buy the same copy of
blue iris app (40 Euros in total). Instead with a bunch of euros I have the same functionality with no extra costs in case of scaling.
However I found the solution to my problem. I made two profiles, one called at work with alerts enabled and one called at home with alerts disabled. In the Blue Iris Settings->Digital IO and Iot I used the control parameters On set and On reset setting the necessary rules to switch between the two.