If you already have a subscription, and choose to purchase additional subscriptions, they will 'stack'. This means that when your next payment is due, instead of taking payment, that subscription will end and the next subscription in your stack will begin.
How much PS Plus can you stack?
This deal gives you three codes for one-year subscriptions, which are rated at 4.8 stars on Amazon. You can either stack them to get three years of membership or share the codes between your friends. The choice is yours!
Will PSN membership carry over to PS5?
Yes, subscribers still receive PS4 games in addition to PS5 games on PS Plus. As mentioned above, PS Plus members get two PS4 games each month as well as one PS5 title.