Sounds like the Tech at the Ford dealer is on the right track. Brake pads are in constant rotor contact and if there is a bad spot on the rotor or maybe you picked up a pebble from the road, you will get a rotational click. Pay attention as to its speed and frequency and report back to your local Ford store when you take it for inspection. Yes you need a lift and brains, not a smart ass on a Shelby forum trying to diagnose your new car. Gonna need to take it in, give them as much info as you can and don’t be afraid to duplicate it for them again.