First of all, according to the traditional custom, the purpose of placing coins under the doorstone is to pray for peace, make money and treasure, and symbolize a good start and prosperity. The bigger the face value of a coin, the better the fortune, so putting the RMB with face value of 1 yuan upward is more in line with the meaning of praying for good luck.
Secondly, according to the traditional culture of China, chrysanthemum is a flower that represents auspiciousness, longevity and honesty, while the People's Bank of China is an institution that represents state power, stability and credibility. Therefore, when placing coins under the doorstone, it is more in line with traditional cultural customs to choose the chrysanthemum pattern up.
In short, when placing coins under the threshold, it is recommended to choose the face with a face value of 1 yuan, and make appropriate choices according to personal preferences and actual conditions.