Yes. The Covenant Eyes program may be installed on all of your personal devices at no additional cost.
Here's how to install Covenant Eyes on your device (CLICK HERE).
When you log in with your username and password, all of the activity will go on your Accountability Report, even if you are on a different device. That way, you only need one username regardless of where you are.
If you would like to see separate reports for another user, then you will have to sign him/her up with a new username for an additional monthly service fee.