My only question is why would angels be guarding this site. Death is final and your ultimate destination is instantaneous upon death.
And what would these angels be wanting to try to prevent?
There are evil angels too.
Christians believe in the bodily resurrection, which is why burial sites have always been important. Platonists identify the human soul or spirit with the immaterial aspect of a man, but both Jews and Christians have always emphasized the union of body and soul. A man is not whole without his body.