With twins, I tried to to get both engines in one camera field from the front and one aft, but the field of view was too narrow. So I mounted mine fwd of each engine aimed like THD described. All ER video displays on the HDTV since it's not normally used while underway.
Here's what it looked like in the middle of the job!
Here's a comparison with ER lights on and off:
Port engine with ER lights on:
AV Selector Panel for video power/camera select, WIFI, Combiner Defeat and Stereo input/speaker controls.