How to decorate the living room facing south, and what to put for good luck?

There are two opinions. One is to put the TV in the south and the sofa in the north. If the TV is hung on the wall, it can only be placed in the east, and the sofa should be placed in the east of the door. But the size of the sofa should be well measured. Just buy two pieces (Princess +3), about 3 meters, or just buy a 3-person sofa with 2 10 cm.