Jose, it shouldn't be necessary to have height speakers angled toward the listening position, although some users have them that way. As Dean discussed in my link in the post above, the height content is ambient in nature and doesn't have to be sharply focused toward the listener. For this reason, the very wide dispersion of the QS4s, positioned above the mains just a few inches below the ceiling, might be an even better choice.

-----------------------------------

Enjoy the music, not the equipment.