Hi Alex,
Actually the option that I am selecting when I am creating the project or adding the zone for active scanning is: Enable active scanning of the connected network.
When I tested this I was connected to an AP 1 foot away and the AP was connected by a 10 foot patch cable to a small netgear switch and the computer running iperf3 was connect to the same switch with a 1 foot patch cord. I mean, we are looking at no more than 2 feet away from all the equipment.