Can happen to any modern engine with no coolant level sensor. In the old days of cast iron heads you just stopped and let the steam die down and topped up with water. Try that with an Ecoboost. Not selling anything, just sharing an idea.

I had a Zetec SE that leaked from the heater matrix pipe (common I think) didn't spot it at first but was about to do a 80 mile motorway journey and saw pink water on the driveway. That was a close one. Its up to you if you trust the once a week bonnet lift and check.