A little 3-D simulation to explore with — not a scored exercise. Pick a roost type, move the camera around it, and watch the same emergence in thermal and visual side by side. Drag the camera in the plan view or pick an angle preset, then adjust height, pan, and tilt to see what each choice does to contrast, target size, and how much of the exit you actually cover.
Field guidance for each roost type lives in the Roost Guide; to practice the detection settings themselves, try the module quizzes.