All our cameras have a 1/4″ screw on the bottom.
You can flip the image feed in the settings of the Camera menu if you mount it upside down.
( https://www.konftel.com/camera-test/ recommend using this tool to test your camera and while changing settings)
Menu => Image => Flip-H On/off | Switch between on/off to flip image Horizontal
Menu => Image => Flip-V On/off | Switch between on/off to flip image Vertical