Good point Laurence, but I don't think there's any real danger. I guesstimate these S80.2's of mine can be tilted 10-15° degrees each way before they would tip over - about the same as my passive Pentas. The center of gravity is a bit on the front side on these, I guess the smaller and flatter models will be even more stable.
I believe the angle is there purely for the looks - if you leave out the adjustment screw as in my last picture, the bottom of the speaker sits nearly exactly above the bottom of the stand.