This is not right, NFS mounts needs to be available once per availability zone, not for each subnet..

For example if you have 3 public and 3 private subnets in 3 separate availability zones, the error is the following

fsmt-0b65688085d114ae1 already exists in stack arn:aws:cloudformation:us-east-2:446807330699:stack/XXXXXXXX/1e2861a0-e7e6-11ec-a395-02518b3e9a32
and various other errors like that

so I believe we need a way to specify where mounts and access points are created, or we pull only the subnets that are required for them to work..

Actually the whole EFS feature works only if you have 3 public subnets on 3 different availability zones, in other words subnet-public-a, subnet-public-b and subnet-public-c

Thanks