This is a best way to be disqualified in a short time. Each server with the same identity will have only part of the data. When satellite comes to audit your server, it can not find the needed piece, because it’s on other server with the same identity, so, audit will be counted as failed. For each your server with the same identity. More servers - faster disqualification.
However, if you would use the shared storage between all your servers, it could work. But it’s just not needed for Storj network - it’s a best load balancer itself.
For the Storage Node Operator it’s not profitable - even with a different identities your nodes will be treated as the only one node, so they do not receive more traffic than only one node. Also, you will have downsides of multiple setup - you can read more there: Add multiple drive, restart node with different parameters, and reduce Storage with out penalty - #14 by Alexey
This is interesting approach, but your mirroring must be faster than audits. Because if your mirror on current node is not consistent with others, you will fail the audit request.
I can suggest you to try to setup a Kubernetes cluster or Docker Swarm with a GlusterFS storage on your fleet of puppies. It could be a working solution.