Welcome to the Community, @deejay808! The Protect Plus Plan will cover all devices at one location. As long as all of your Ring devices are showing up under the same location in the Ring app, the subscription should cover all of them. As it sounds like you paid the price of the yearly subscription up front, there should be no additional charge, other than any tax difference or difference in region/ currency. Please note, that the Protect Plus plan is $10 per month ($120/ yr), when paid on a monthly basis, but it looks like this does not apply to your situation.
As mentioned in our Protect Plan changes help center article, you should receive a prorated refund for any amount left on your Ring Protect Basic yearly plan(s). The Ring Protect Plus Plan will be charged immediately and you will begin a new billing cycle. This means the basic plan should not be in place, unless it is applied to another Ring device specifically that might be at another location.
If this information does not describe or resolve your current concern, our support team should certainly be able to look further into this for you. Please give our support team a call at one of the numbers available here. We’re taking additional steps to protect our team and help reduce the spread of COVID-19, so this has resulted in longer than normal wait times. If you are outside of the US, please read our response to COVID-19 here to see how to contact support.