It was auspicious, but it was very unlucky to put it on the grave. I am happy with the sunshine, but the yin in the grave is very heavy and humid. Therefore, putting the brave dog in front of the grave will not only fail to pray for making money, but will affect the fortune and make future generations unlucky.
3. From the perspective of geomantic omen, the spirit of nails is destructive, so nails cannot be placed on graves, otherwise its destructive power will affect the original pattern and destroy the geomantic omen of graves. So that the ancestors of the underground undead can't get peace, and future generations will have bad luck.