For my fairly large centre I bought the
ISO-L8R430 Isolation Stands to tilt it up. You can change the tilt angle by using supplied tubes, and I added some small rubber door stops to increase the angle.
This works great and is fairly discreet looking, I'd say
, at least compared to the wobbly stuff I had earlier (both looks and stability). Tilting down, that is another matter, for safety reasons, as then I must secure it with screws into to the centre speaker