Is it particular to set up a lunch table on the ancestral grave?

One particular point is to build a lunch platform on the ancestral grave. The main emphasis of worshipping Taiwan is reflected in the direction, distance and size, as well as whether the table top is flat, whether there are pits or gaps.

1, the altar is in the mausoleum, in front of the tombstone, and the direction and orientation should be opposite to the tombstone.

2. In terms of distance, it is necessary to ensure that people keep a distance of more than three feet from the tombstone when they worship.

3, the size is the same distance, three feet three, square table.