a very cheap and simple solution!
i bought some silicon bubbles for furnitures and stick them at the 4 corners of the case
so i put my S7E silver with its spigen case and pure gear screen protector into my fish pond for a test
video turned out good sound was bad because of the pump inside the pond so i canceled it
slowmotion video test
tbh, that slo mo blew me away, video quality is awesome
video looks even much better on the phone youtube compression is bad for slow motion
much better then Z3 ...
the photo of the my scooter at night is also not bad for a phone without OIS