Actually the claim in the op is not very far off. You are generally instructed to place the monitors in even 60 degree angle triangle pointing at your ears when
listening to music for the nice stereo image. I was instructed by
Tipi Tuovinen to place the monitor so that they are a shooting a bit off from your ears when
creating music by either making the triangle larger or turning the monitors a bit wider, but the point is the get the sweetspot just a bit behind you, because the stereo image is clearer and wider sounding that way and it's pretty nice because if you then want to go to the sweetspot, just go a few feet back. I had scribbled something like this in my notebook: