PowerCLI would work great, especially if you use the Import-CSV command with files already populated with the ESXi hosts and NFS datastores.
nfs-datastores.txt - Datastores to map.
vmhosts.nfs - ESXi hosts to map datastores to.
Connect-VIServer -Server vcenter01
$dsin = Import-CSV nfs-datastores.txt
$hosts = Import-CSV vmhosts.nfs
foreach ($vmhost in $hosts){
write-host Doing $vmhost.vmHost
foreach ($ds in $dsin){
$x = Get-VMHost -Name $vmhost.vmHost | New-Datastore -NFS -Path $ds.NfsPath -NfsHost $ds.NfsHost -Name $ds.NfsName write-host $x }
}