Where should the vocal image be?

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Then if you want image focus and depth they need to be toed in quite a bit. The more toe in the deeper the stage.
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Well toe makes little difference in depth on my speakers.
The distance top back and side walls however make a lot of difference.

I suspect that the horizontal dispersion pattern has a role on toe needed?
Maybe those Moab’s need more than a good speakers requires?
(For the OP - It is definitely worth playing with the toe-in/toe-out though.)

Maybe 10-15 years ago I started moving the speakers around and go a magical spot where the sound was ~5 feet behind the wall.

Dragged the Mrs into the room, and she said she had never heard speakers sounding like they came from outside of the room, and also was distressed because she could not hear the speakers themselves as separate things.
She asked, “How does it work to make them sound like they are not there?”… I said, “It’s PFM”.

My answer is 1.5; somewhere between:

1. On the same plane as the speakers.

2. About mid way between the listener and the speakers plane.

Depends on the recording, though.

Usually sounds behind and midway between the speakers, mid-height too. 

Mike

In front of the front omni's with a believable spread.  But as Erik points out, program dependent.

Done it before, just upgrading my means currently.

Turn it over to the 'bots, they've nothing else to do for me.... ;)

BEHIND

Vocalists at proper scale (ie the visual auditory image is human scale or slightly larger) should be behind the plane. Exaggerated scale or vocals that are too forward indicate peaks in high-frequencies and can cause destruction of a 3d stereo image.

Agree with many here who say the recording, etc. are influential. Also, agree that test tracks are invaluable for calibrating a system. 
 

(not to get involved with the toe-in discussion, but the "mid channel" of the stereo signal (where many vocals live) often emanates from the side of drivers and LESS toe-in can increase the mid channel content, like vocals. So toe-in and speaker position definitely are very important to vocal depth.)