Chess4Life recommends this easel style demonstration chessboard tripod. It works well for 28" and 36" demonstration boards.
These wall hanging demonstration boards do have a lightweight string to attach to a hook. But this limits you to the options available in your particular room or environment.
To hold your demonstration chessboard we recommend this Lightweight Aluminum Flip-Chart Presentation Easel, 70 Inches, Black.
With an easel, you're in control and you have a relatively sturdy setup for anywhere you need to display a chess board.