Tried, doesn't work :(
Prefab View Settings:

Camera settings:

It spawns the monster prefab at -1000,-1000,-1000 (which I guess is fine for now), but no camera, no view of that prefab, nothing. This is what it looks like:

What am I missing? Thank you
EDIT:
Ok I needed to create and add a render texture. Smth new for me, so I tried ignoring it, but it's a crucial part of the setup.