Thank you very much for your kindness in sharing this information 🤗
No, you're correct that the deco takes up 4x4.
There's a bugs post on the issue HERE if you'd like to add to it.
Finished this and got the Ruby Cake Display. Any sense in buying the blue sapphire? I did accept some parts in case. Have been reading the info and think it is not worthwhile though. I did have it listed at higher price but it was dropped to 15 during the holidays.