Trigger when something enters the Field of View of the Camera

Hi,

i want to trigger a script when an enemy enters the Field of View of a specific camera. The field of view of my player charcter. There are more cameras in the scene.

The only solution i found is to use a specific pyramid-like mesh und attach a mesh collider to it. (The mesh is the prop_cctvCam_collision from the Stealth Tutorial).
That seems to work for now, but it feels clonky. Is there a better way to do something like this?

Thanks in advance

chef_seppel

try using raycasts