There should be support behind the sofa: the so-called support means that there is a solid wall behind the sofa that is reliable and has no worries, which is in line with Feng Shui. It is for this reason that natural marble is chosen as the backrest for the chairs used in the courts in past dynasties, and the patterns on it had better have a faint mountain view.
If there are windows, doors and passages behind the sofa and there is no solid wall to rely on, it means that there is no backer behind it, it is empty and it is difficult to make a fortune.