Option A.) Don’t bother tinting the window covering the engine. It’ll inevitably fail.
Option B.) Watch out for the back window, as it can be a little tricky to maneuver in that tight space.
Option C.) Tinting the visor can be a potential issue, as there’s a built-in dashboard cam. A 5% film should be fine, however. Avoid the area entirely if you’re concerned about liability concerns.