Edit: People are reporting it works with the sprint note 3 and doesn't trip Knox.
I gave the towel apk a try and I must say an excellent and easy root . I went from slim rom back to nc5 stock uprooted . Down loaded root checker pro then from the stock browser I downloaded the apk file . No problems with my reinstall of twrp. No problems flashing a new rom . Will say that busy box needs to be reinstalled but having no problems at all