Is it better to be buried separately or in groups?

Nowadays, people in many places build family graves, or in most areas, two old people are buried together. In fact, everyone's birthdates is different, and the mountain direction they adapt to is different. They are barely buried on the same hill, one gram of life, or two grams. Such feng shui consequences are self-evident. People don't have exactly the same five elements, and they don't have prosperous fortune. The characteristics of family graves are "one glory is all glory, one loss is all loss", which is the truth. There is a nation in China, which has always used separate burials, that is, two old people are buried in different places. In a short time, the population of this nation has grown to tens of millions of prosperity. This is a good example, so I think that separate burial conforms to the principle of geomantic omen.