The best thing for that is to use a load balancer. That way you only add the VIP in the NADs config and then you can manage the individual AAA servers directly from the load balancer :)
If you don't have/want a load balancer then you can look at a tool that can push configs to multiple devices like NCM from Solarwinds or Cisco PRIME.
I hope this helps!
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Thank you for rating helpful posts!