From looking at the Wyze Cam 3 Pro on-line it looks like the basic design is the same as the V3. So from experience I can say for sure the V3 design shouldn’t be mounted upside-down in wet environments. When upside down water pools on the bottom of the camera around the reset and memory card door slot. Even though both are covered by a rubber gasket they are not water tight and they both will allow water in.
When right side up the camera works much better but even then over a long period of time I have had Wyze replace multiple cameras. The good news is that today they just sent me a replacement for a camera they already replaced once before. So as long as you have issues even if your beyond the first year of ownership they appear to continue to send you new cameras.
Hopefully at some point they will make ones that really are good in the wet but for now I guess we just keep replacing them every eight months or so.