That Drone Defender device would actually be ineffective against these types of drones if they're set up correctly - you'll be able to disrupt their command link, but the Pixhawk autopilot that controls those systems can fly via dead-reckoning, operate 100% autonomously and be set up to return to certain waypoints (or just keep flying a certain path via INS) if GPS becomes denied. Obviously if you're trying to do something like deliver a munition to a certain target, there would be issues, but for recon it wouldn't be much of an issue - you could still receive live telemetry as well; just not send anything / much back to it.