The ideal flooring is concrete, or you can place the VibraSonic on a piece of granite or marble. You can have a thin carpet over concrete, but not heavy carpet pad or thick carpet. The Ground floor is best, but if you must place it upstairs, place a piece of granite over a supporting beam or supporting wall, then place the VibraSonic on it.
Wood has a resonant frequency, and the VibraSonic will find it going through a whole body cycle. If it is placed on wood, we recommend a thin piece of carpet pad with a piece of granite on top, and over a supporting wall or beam if on an upper level. A 4’x4’ piece of granite is ideal, but a 3.5 x 3.5 foot piece will work. Many times you can find these as a remnant of a countertop from a supplier.