iPhone or kindle attachment for treadmill?

The treadmill is the only time I get to read or watch Netflix. I can zone out easier on my runs than if I stare at a wall (outdoor running isn’t ideal; we live in the country with small back roads; I’ve been almost clipped way to many times, even if I’m stopping to get in the ditch. So I prefer to stay away from the crazies). Having my phone on the treadmill screen isn’t ideal though; it rattles when I run, is in the way of the speed adjustment and I don’t like looking down. Im wondering if anyone uses an attachment on the treadmill for their phone or kindle, to watch while on it?