Foam stick-on: The easiest technique is to use the foam stick-ons. They are inexpensive and are throw away items. They are easy to adjust the position of the stick-on but, the drawback is they will leave an adhesive residue on the tippet.
Poly yarn: Next is to use a short length of poly yarn, color of your choice. Tied on with an overhand knot, up against a tippet connecting knot (blood or surgeons) should keep it in place. It's easy to cut off when finished and a throw away item.
Make your own: The yarn in the center of the above photo, is the yellow yarn from the bushy indicator in the top photo. From one of the bushy indicators, you can fabricate a couple dozen of the indicators as seen in the center above. Placed in a vice and bound with floss or thread of your liking creates a solid configuration that is easy to trim to any profile.
Practice attaching these to a tippet so you don't waste time on the river tying to get it to stay put.