This situation needs to be determined on a case-by-case basis.

"Opening the earth red" can be understood as "opening auspiciously" or "making a good start". In traditional Chinese culture, red is often regarded as the color of auspiciousness, prosperity and luck. Therefore, "earth red" can be regarded as a symbolic color, implying prosperity and good luck. As for how many bunches of earth red to put, there is no fixed amount. Generally speaking, it can be decided according to the actual situation and needs. If you want to be more auspicious, you can choose even numbers, such as 6 strings, 8 strings, etc., because in Chinese culture, even numbers are usually regarded as auspicious numbers.