I primarily print in PETG for my projects. PLA would not be great outdoors. ASA is even better than PETG for UV resistance, but I'm not fond of generating fumes during printing.
I chose black color to help the PETG resist UV, but know it won't be a forever lasting thing. If I can get five years, I will be happy. I have had good experience with my pole mounted 3D printer PETG mount. That has been up for a couple years and is holding up well in sun, snow, and LOTS of rain.
Printed as one piece which slips over top of lamp post.
View attachment 182866
One of the turret mounting rings attached.
View attachment 182867
Mount slipped upon lamp post
View attachment 182868
The final installation with two turrets to assist the PTZ's. You can also see my "brims" protecting the turrets from rain.
View attachment 182869
Based on this experience, I expect the new dual Z12 mount to do well in PETG. I might not fully trust the new mount in vertical position, given the 7 lbs of camera that will be torquing it. Thankfully, it is going on a horizontal junction box.