@kdude66 (Kenny) - I spent way too much time last night messing with the height of that tweeter array. And, like you indicate, center tweeter at ear height sounds best. That's basically where I started at but, of course, I wanted to be sure. (Ha!). I think I have the positioning dialed-in but I still have to make sure my sub is correctly tuned for these speakers. So still more "preliminary" work to do.
@backsigns - The speaker stands I've had for awhile. I'm not sure of the brand. I can tell you they are solid wood and are very heavy. I had to do a little work on them when I got them such as refinishing and adjusting one of the top plates but really no additional bracing was required. They are height adjustable via removing the center-pin and repositioning the center column up or down.