Salam,
It is the popular meaning of muslims to have angles to side,one to the right and one to the left,these angles record every deed and speech of the Person which they accompany down.In islamic secondary sources,you find names of the angles and it is also a belief that the salams at the end of the salat are dedicated to those angles.
Now i have read that god send us angles which are in the front and at the back(sorry i couldn' find the ayat where it is written)
If These angles are infront and back of us,then the salams at the end of salat are obsolet.
wa salam