Ask for expert advice: what feng shui items should be placed under the floor of the door?

This should belong to the feng shui method. Generally people are used to putting coins or other feng shui mascots under the entrance, such as sailing boats, with the bow inward; Or a carriage with the horse's head facing the house, and so on. However, as the upstairs said, you don't know where you opened the door and what kind of stars you are facing, so you can't be sure whether you should use coins or other items (if you put them wrong, it may cause punishment and harm) or how much you should use. I suggest you read the book The Wizard. Here are some introductions. The electronic version of this book is also available online. If you can't find it, you can ask me.