If you want to know the installation process for multiple devices norton.com setup and you have to allow multiple installations. Then you have to install your protection without paying any extra cost on additional PC, Mac, or mobile devices. at no extra cost. Choose the seats that you can find with your subscription to check that your Norton subscription protects other devices.

Enter details and log in to your account.
Open the My Subscriptions tab and there you will find your subscription plan.
Read out the number of licences available on the subscription for installation.
To protect more devices you have to install additional licences available.
https://1-norton.com/setup