2, the sofa is best placed against the wall, not facing the passage, not behind. From the perspective of geomantic omen, you are carefree with your back against the wall. If there are doors, windows and passages behind the sofa, and there is no wall to lean on, it will form a loose situation and people and money will be hard to prosper. The remedy is to put furniture such as screens and low cabinets behind the sofa to artificially create a backer. Things are a little better.
3, the sofa is most afraid of the top of the beam. Whether in the living room, bedroom or kitchen, the top of the beam is a taboo.