From the Norton 360 Multi Device system requirements
Operating Systems Supported
- Android™ 2.2 or later (smartphones and tablets that have the Google™ Play app installed)
Have you tried going to the Amazon App store and searching for Norton 360? That will take you to the Norton Mobile Security for Kindle app. This should be the app you should install and try to activate with the key from 360 MD.
You cannot install the actual 360 program on tablets or smart phones.