The peep should be tied in at a height which naturally aligns with your eye so that when you come to full draw and anchor you are automatically looking straight through the peep with no adjusting yourself to get aligned.
I think most people use a D-loop tied above and below the nock. the majority of variation lies in whether there is a nockset between the D-loop and nock.
I think most people use a D-loop tied above and below the nock. the majority of variation lies in whether there is a nockset between the D-loop and nock.