Can I display more than five mannequins?

The information here only confirms that one setup stopped at five. It doesn’t establish whether that’s a fixed limit or whether another build condition affects it. Check the placement counter or message before buying anything else. If it still stops at five, plan the room around five outfits rather than counting on a workaround.

If the main reason you bought the set was to display seven outfits, a five-slot cap can feel like poor value. I’d judge it by whether five displays are still useful to you, and hold off on spending more until you can confirm the limit.