I need help placing my JBL S36II surround right speaker. My surround left speaker can basically be placed anywhere on my left wall as there are no openings or windows. My surround back speaker can also be placed on my back wall without a problem. Basically, to the right of my couch I have an opening to a stairwell that leads upstairs, so the vertical and lateral placement of my surround right speaker will dictate how I place my surround left and surround back speakers. My room is 13' (w) X 23' (l) X 8' (h). I am planning to place my surround right speaker vertically on the right wall just before the opening that leads upstairs. It would be 2-3 feet above ear level when seated on the couch, about 1-2 feet in front of the seating position, and slightly angled towards the back (the wall-mountable base of the S36II is not flat, its angled about 10-15 degrees). I'm not sure this is a good position because of suggestions that the surround left/right speakers should be slightly behind the listening position. My other option is to place the surround right speaker horizontally, at ceiling level (there's an overhang in the opening that leads upstairs). This way the speaker would be 4-5 feet above ear level, 1-2 feet behind the seating position, and angled slightly downward (10-15 degrees). I am concerned about this position because I think 4-5 feet may be too high relative to ear level. I know people will say to try it out and hear what's best, but I can't really do that without drilling a bunch of test holes into my wall, which is something I ultimately want to avoid. Please advise which of the two options you think would be best? Thanks in advance.