As many have said, it's the combination of speakers, room, electronics, and recording that makes the difference.
Room is the absolutely dominant factor. Next, I find speakers with a narrow baffle and well-designed crossover to be reliably good imagers (which is the real definition of "disappearing speakers"),
Here's a step I use in setting the final placement of my speakers:
Get a copy of Grand Funk Railroad's "Closer to Home" and play "I'm Your Captain (Closer to Home)."
If your speakers are set up close to optimal imaging, you will hear the music clearly pass behind your head a couple of times during the song.
Once you have that working, you can make final minor adjustments to speaker positioning. But I've found that until I get that behind-the-head effect working, I'm not close enough to adjust for optimal sound stage and tonality.