I finished up my CIP#2 MSR.

Now on the the next...
(I can add this to DIS Churners but thought it would be ok here since this post isn't about advanced strategies...just a new Amex to keep my MRs active. Let me know if it would be better elsewhere!)
My Amex Plat AF posts next month, so I need to open a new Amex. Which would be the best to keep my MRs Active? I would prefer not to get another high AF card ATM since we have DH's Amex Plat and a CSR.
We don't travel a whole lot so I am not tied to a branded hotel/airline currency.
1. My plans for my MR/UR is to use them to go to Australia/NZ in the beginning of 2022. If I want to transfer them (MRs) to an airline, do I need a "premium" Amex to do so (like the CSR?). I would be looking to transfer late 2020 or early 2021.