VESA floor stand for iMac, or equivalent

Howdy, I am planning a basic setup for simple compositions, based on Logic Pro. It will be in the living room, so it needs to be simple (no clutter), compact, and look reasonably nice. The keyboard controller will be a digital piano with built-in stand: a Yamaha, or Casio, or Kawai, one of those nice 88-key pianos with MIDI, that can also be played without turning the computer on. I will screw a sliding keyboard/mouse tray under the piano. I'd like the iMac to be positioned vertically just above the piano, and horizontally between the piano and the wall behind it, and still have the piano as close as possible to the wall. It seems to me that getting the iMac 24" and a VESA mount is the "thinnest" option, rather than finding a stand for the iMac. (I would need a 24" iMac because the 20" does not support VESA---not well, anyhow). But I haven't found a floor-standing mount that would make the iMac hover at the right height, centered at about 48". They are all too tall or too short. Screwing the mount on the wall is not an option because of some nice wood paneling. Does anybody have suggestions? Thanks!