Lighting position is the geometry decision that determines whether your face reads as well-lit or as harshly shadowed. The principle: light source at roughly 45 degrees to the side of your face, slightly above eye level, with the streamer facing the camera and the light source diagonally between camera and streamer.

The configuration with a single ring light: place the ring light directly behind the camera, at eye level, with the camera mount in the center of the ring. The ring shape produces even front lighting that flatters the face and eliminates the shadow patterns that single side-lights produce.

The avoidance: never place the light source behind the streamer (which produces a silhouette effect with the streamer's face in shadow). Never place the light source directly above pointing down (which produces unflattering shadows under the eyes and chin). The ring-light-behind-camera setup avoids both problems automatically.

The window-backlight problem: if you stream during daytime with a window behind you, close the curtains. The window's brightness overwhelms any ring light positioned in front of you and produces the silhouette effect.