Mod, you may be able to attach an angle plate(made of wood) to the top of those brackets, then attach the T-bracket from the QS8 to that...voila! speaker sitting upright as it was designed too be. If you aren't able to make an angle plate, think of a very small ready made wood shelf from one of the box stores flipped over, one face mounted to your stand, the other face with your surround attached.

Half of communication is listening. You can't listen with your mouth.