My dashcams are usually mounted a few inches clear of the headliner so they can have a clear view around the sensor housing behind the rear view mirror, and I have plenty of frit area for them to be mounted on without being too noticeable from outside. They are however rather obvious from within the car.
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From a practical point of view I like having all 3 cables plug into the mount on the S1, although I feel 3x right-angle plugs looks a bit untidy.
I think the A329S looks better with a pair of right-angle coax cables exiting the side of the main camera although that does make it more cumbersome to remove the camera - perhaps for cleaning the glass or to bring the camera inside for testing. I'm not so pleased with the appearance of the right-angle USB-C plug of the HK6 exiting the top of the GPS mount, however I appreciate that both cameras would look better if they were mounted at the top of the glass.
I remove the S1 4K on the right whenever I need to access the microSD card slots in either the A329S or the S1 4K, which has been a few times a week during testing, so I appreciate that it's quick and easy to do. Most owners will have a single dashcam and leave it in place for long periods of time, so I suspect ease of removal is less important for a regular user than a dashcam tester with side-by-side cameras.