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Thank you for asking this question in the Support Community. There are multiple ways you can design and configure this application. How you chose to do it depends on network requirements, scaleability, and failover requirements.
Will the VRRP address of the NV1638s be the default gateway for the devices on the network? If so, then the concept you mentioned is correct, you can have separate subnets/VLANs between the ADTRAN's and the router (router's IP address will be the ADTRAN's next hop for the default-route). With this design, if either switch failed, then the other switch would be the VRRP master, and use the local route to the router.
I hope that makes sense, but please do not hesitate to reply to this post with any additional questions or information. I will be happy to help in any way I can.
I went ahead and flagged this post as "Assumed Answered." If any of the responses on this thread assisted you, please mark them as Correct or Helpful as the case may be with the applicable buttons. This will make them visible and help other members of the community find solutions more easily. If you still need assistance, we would be more than happy to continue working with you on this - just let us know in a reply.
Would I be better off going with an activchassis configuration? Would activchassis take the place of VRRP or would it work in conjunction with it? What benefits would that have over a VRRP configuration as specified in the diagram? If we use activchassis, would it be acceptable to start with just two 1638 switches, one as a master and one as a backup? We would then add 2 linecards in the future.