I use 2 1/4" binding.
I sew to the back using a scant 1/4" seam.
I use the "blind hem stitch" foot. (some call it a stitch in the ditch foot)
I bring the binding to the front so that the fold of the binding goes 1/8" past the stitching line formed by sewing the binding on the back.
Place under the foot so that the fold is against the "fence".
Move your needle so that it touches about 1/16" to the right of the fold.
If you keep the fold against the fence while you sew, you will get a perfect line of stitching on the front and a line of stitching just below the binding on the back.
Be sure to put matching thread for the back in the bobbin.
P