Can feng shui single point be used? Is it unlucky?

I don't know what you mean. You want to ask if it's okay not to be buried together? In that case, you don't have to worry at all. In the past, men and women in the big house were not buried together, and their father was buried in Dongshan and their mother was buried in Xishan. Unless there was only Longzhen Cave, modern people did not have the conditions of the ancients, so they were buried together more.