What you have read in a magazine is kind of the same Diamond is saying. She says in one of the first discs in Level 1 that it`s best if the bed is big and has space on both sides..
But I didn`t get the impression that she emphasized this any particular. In the manual page 24 it says that the Direction is most important, nr 2 is to be out of the flow from the door, and nr 3 is to see the door.