I think it is a good idea to have some sort of a device to lock the Scrabble tiles in place.  Winning Moves did it by placing small posts on every corner/intersection on the board.  It doesn't lock it in a way that you can invert the board and the tiles remain attached like a gecko on the ceiling, but you can tilt in an angle or slightly nudge the board sideways but never bump it from the bottom or the tiles will fly everywhere.  I think Scrabble boards should spin like Lazy Susan but that is not always possible unless you get the more expensive boards.  The Tile Lock Scrabble at least spin better with the tiles staying in place when someone else's turn.