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Been using the RAM® Quick-Grip™ Spring Loaded Holder https://www.rammount.com/part/RAM-HOL-PD3U
with my iPhone X and can report that the holder works good bu that you need to have your phone in a case to make it fit good.
It is not as good as the holders made specifically for the iPhone 6,7 and 8 but works good enough.
Unfortunately the image stablizer of the iPhone X makes it unusable as far as I can see.