There is no fixed standard for whether the sofa backer should be higher in feng shui than the sofa.
Sofa backing means that there is a solid wall or a low cabinet behind the sofa as a backing, which can protect the sofa and bring a sense of stability and security. In Feng Shui, there are no special requirements for the height of the sofa backer, as long as it can protect the sofa and will not have a negative impact on people's health and fortune.
Therefore, whether to increase the height of the sofa backrest needs to be decided based on the actual situation. If there is a solid wall or a low cabinet behind the sofa as a backing, and it will not have a negative impact on people's health and fortune, then there is no need to increase the height of the sofa backing. If there is no solid wall or low cabinet behind the sofa as a backing, or it will have a negative impact on people's health and fortune, then it is necessary to increase the height of the sofa backing.
In short, the height of the sofa backing is not the only factor that determines the quality of Feng Shui. It also needs to be combined with other factors to make a comprehensive judgment.