The UniFi G5 Bullet Pro camera has a mount that allows some angle variation, but it's limited - especially when mounting to a ceiling.
This can be used to add some height/offset to the mount, and/or add some more angle.
Fusion 360 file is included for changing dimensions.
It will require longer screws than those which come in the box.
Make sure you use a material appropriate for the conditions for the camera, and install it according to the installation instructions.
The author marked this model as their own original creation.