Creating multiple servers with a shared volume

Hi, I am planning to spin hundreds of servers with a shared storage. I have created one instance and attached a 1 TB volume (multiattach) and created a snapshot of the instance. But when I spin another server using the snapshot, I noticed that instead of expected shared volume, individual 1 TB size additional (dedicated) volume has been attached to each VM. Is there a mechanism where I can create multiple instances along with a shared volume attached to the instance instead of attaching later? Regards, Danishka