AntiqueSmith Magnetic Decorative Garage Door Curb Appeal Faux Hinges Handles Hardware Kit Color Black

I have very little room above the garage door when the door is opened. The handles may hit my ceiling. How high do they sit above the door?

Where are these made?

What are the magnets attracted to? Does your door have to be made of aluminum? My door is made of wood.

Do the magnets mess with any mechanics /electronics of the door? (The way magnets might with a cell phone, eg)