I have a 5 device Norton 360 Deluxe subscription. I recently purchased a 6th device that needs protection. Can I add a 6th device to my Norton 360 Deluxe subscription for an additional (incremental) annual cost or must I purchase a new subscription that provides protection for more than 5 devices. In short, I don't need to protect 10, 25 or 50 devices, just 6. Thanks in advance for any replies.