One extra rack is required to display the magazines of the Far Harbor and Nuka-World add-ons.
Six racks are required to display all 120 place-able magazines of the base game, as the " You're SPECIAL!" book can't be placed on the magazine racks. To display issues of a particular magazine type together and in numerical order, one can transfer all of the issues owned of any given magazine type from a magazine rack back into one's own inventory briefly, then re-store them in the rack by running from top to bottom in the list in the Pip-Boy the magazines will display in that same order when the rack "re-loads" upon exiting out of the Pip-Boy. By contrast, magazines are relatively more likely to stay put in the rectangular racks, although the NPCs may sometimes still disturb them. The knocked-over magazines can usually be found on the surrounding floor.
Non-player characters (NPCs) are likely to knock magazines out of the rotating racks.