If you look at the tilt chart in the manual, you'll see that for a 36" ear height at 8 feet it has you tipping the speaker back until the top rear of the speaker is 1/2" behind the bottom rear. Since the speaker is 4' tall, this means the top of the speaker has a slope of
1/2" / 4' = 1/8" / ft => 1" rise in 8 ft
In other words the speaker is tilted so that the listening axis is pointed at your ears if you were sitting 8 feet away. If you put a laser level on top of the speaker the laser line would rise 1" from its height just in front of the speakers to the height at the listening position. (For my Craftsman laser level, it would rise from 50" to 51").
If you're listening height is 36.5", the laser line should rise 1.5".
Usually I'll get one speaker at the right tilt, measured with a tape measure, then set the tape measure on the floor and extend the tape up just behind the listening chair. Then adjust the tilt of the second speaker so that the laser line heights matches up on the tape measure.