What is the minimum distant for Zu?

IM THINKING IM WAY TO CLOSE TO THE FRONT WALL, THE MORE READING I DO.

I WAS JUST TRYING TO STAY FARTHER THAN 10 FT ON THE DISTANCE FROM MY LISTENING CHAIR.

Why worry about what other people think? Put them where they sound good to you. Sorry, I just don't understand why people ask this sort of question.

I assume that there are distances that produce better results than just randomly trying positions

All rooms are different. It is my experience that all speakers end up sounding the best in the same location in a given room. If you used speakers in this room before and found the optimum location that is where these speakers should be. If not, it is trial and error until you find it.