I have a pair of adjustable stands that I bought years ago from Ascend Acoustics.  Nothing special: black painted heavy gauge metal, one square hollow shaft roughly slides inside another with a nut to tighten at a range of heights, about $100/pair as I recall, but no longer available.  Small speaker wires can fit inside.  The shafts are tilted backwards.  Holes in each base allows spikes to be added.