Do you like your speakers aimed directly at each ear or....

Think of your toe-in angle as a treble level control and an imaging control. Straight ahead to start, then dial in gradually to get the right tonality (clear and detailed but not too sharp) and image specificity (image wide and deep, objects distinct side to side, front to back not too diffuse and confused).

Depends on room and EARS. I have found the 1 or 2 inches can and does make a difference.

I like my speakers mounted on gimbals that swivel to keep them constantly aimed .... but I can't tell you where then you would copy it and I wouldn't have the best stereo in the world any more.

9 feet from couch, 9 feet apart, 
on carpet spikes, great sound.
slightly toed in to my sitting position!

System 1.
Quad ESL57 aimed at ears. Straight on with no tilt. Accurate to millimeters. Head in a vice. 7’ on center, 8’ from listening position.

System 2.
Gentle toe in to outside of ears. 8’ on center, 10’ from listening position.