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.