my easels have extra rubber feet in the middle (not quite in the middle, just off center a bit) of them that allows you to hang them off the edge of the baseboard and still stay flat. You do have to be careful not to bump when inserting paper it as it will move easily. Otherwise, a suitably sized piece of MDF or Chipboard could be placed on the existing baseboard for the times when you need it. I'd grab a couple of suitable clamps (clamp to existing baseboard at the back) to ensure that doesn't go tumbling down when you put the easel on it.