How many SSN's will Norton 360 Deluxe with Lifelock protect?

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How many ssn's will Norton 360 Deluxe with Lifelock protect?

[Edit: Clarified subject]

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 One social security number per person, per membership -

Add a member to your LifeLock account
You can add a member at any time by signing into your Member Portal. In rare cases, certain types of memberships cannot support adding members this way and require you to call Member Services and Support.

For United States
Everyone has a different social security number, so we have to charge per person, per membership, as this allows for each individual to receive our Million Dollar ProtectionTM Package^. If you're a victim of identity theft, LifeLock helps protect you with our Million Dollar ProtectionTM Package^ including our Service Guarantee to provide for experts and lawyers, if needed.

https://support.norton.com/sp/en/us/home/current/solutions/v126242011 

LifeLock only product, member may reach support at https://memberportal.lifelock.com/support -
Norton product with LifeLock, member may reach support at https://support.norton.com/sp/en/us/home/current/contact -