I use a single broadhead sheath. I attach it to a piece of leather about 3/8" wide to wrap around the thinner part of the fade out. This pads a zip tie. After tightening the zip tie, I slide and wiggle it down tight onto the fade.
On the other fade, I use a piece of soft lacing. Tie a good flat square knot for the arrow to rest on and prevent noise. I just make a loose half-hitch around the arrow, just to hold it secure, but it will release the arrow when I pull on it.
This is with a laminated bow, but it should work fine on any bow, and does not inhibit bow performance.