Behind the desk is Xuanwu Square, just like the backer behind people. Static is recommended.
When the sofa coffee table is behind, the back line will move and the backrest will be unstable, so scheme B is still recommended.
In the second scheme, plants or decorations (crystal holes or decorations) can be used in the space behind the chair, and some feng shui objects can also be used to enhance the feng shui of the office.