It means eternal life Location usually depends on specifications. In the past, there were rules for planting trees, according to levels.
Generally even, 2, 4, 6, 8, 16 trees are planted on both sides of the monument.
There are no rules now, depending on your wishes and the size of the cemetery. ...
The best location is due east, due north, southeast and southwest, leaving a certain gas field space, at least 1 meter away.