It is ok to raise or lower the bottom appropriately, but it depends on the specific situation. If the left and right sides are high, and the foundation of other people's homes is higher than their own, they should be raised. It is of great benefit to raise them a little higher than others, especially on the left and right sides. If the left and right sides are obviously lower than their own, there is no need to raise them. The taller they are, the worse they are. It is necessary to lower them slightly. They stand out from the crowd and are easy to attract lightning and be targeted. There are many weaknesses and deficiencies that deserve attention and attention.