Another machine sewer here. I sew the binding to the back with a 1/4" seam, mitre the corners then flip over to the front. I don't pin or glue the front binding down, I simply sew nice and slowly using my seam ripper point to nudge the binding neatly under the walking foot. I then sew very close to the edge. I don't know why but my mitre corners come out much better this way rather than when I hand stitch.