How to place speakers at the optimum height

The height of the speaker has a lot to do with how close your listening position is.
If you listen at near feild like I do, then it's much more critical on the hieght.
I prefer my ear to be between the mid driver and the tweeter. Some like the tweeter to be ear level.
If you listen at 8-12 ft. away the hieght is not as crucial.
You can also leanthe speaker forward or back to aim a certain driver or tweeter more to your ear hieght to help in what you think sounds the best.
I like my tweeters to be a little off axis instead of ear hieght. But then, some speakers call for critical hieght on the tweeter.
Try different hieghts and judge for yourself what you think sound the best.
Hope this helps.
John

Not all speakers need to be toed in so much. As long as you keep a solid center, toe them out to get more sound stage width. If you hear your center losing focus you went to far. Most speakers sound there best a little of axis.

The VR4's are very picky about getting there position right, but when you nail it, you'll know it.
The rear tweeter once set up properly will really enhance the sounstage and imaging.
It's going to take a while of tweeking a little every day to get them just right, but it'll be worth it in the long run.
When you find the sweet spot for those speakers, they will absolutly disapear.
Have fun.

Yes.
The soundstage location comes from the center of the speaker arrangement. No mater what the toe in or out or the angle , back or forward. The soundstage will seem to be comming from the center of the mid driver and the tweeter. The woofer will be a omni-directional sound.
This has been my experience. Not everybody will agree of course.