If Turbonomic is targeting your Storage Array, you do not need to manually set the IOPs as this data is auto-imported from the array. To setup configuration with your storage array, check out this post to see supported vendors and setup instructions: Target Configuration: Storage - Setup Glossary
Without a storage array targeted, by default, Turbonomic assigns an IOPS capacity of 5,000 to each datastore. Different storage types, storage clusters, or storage groups may share the same IOPS capacities. Watch this short video to see how to enter your capacities.