They're lying around (closet, shelves, floor). There are dozens of them. Only keep one on my desktop's tray and one in the backpack.
Although, I'd like to sell off everything but one or two home ergo boards (ErgoDox, and Axios or Maltron in the future), one or two portable ergo boards (TypeMatrix, and Planck or Atreus in the future) and something modded for gaming and #swag (QFR).