Yes, new Dgraph Alpha. With a diff port offset. (multiple servers)
This will depend on the way you set up your set. If you are using Docker, K8s, Local Binaries. They are different ways of dealing.
Ratel accesses the Dgraph via HTTP. That is, each Alpha has to be accessible.
For example, if using local binaries, the use of different --port_offset is mandatory for this. If you are using docker the offset may also be necessary, but if you are using reverse proxy it would be different (depending on which http reverse proxy you are using) you would have a path for each Alpha if that were the case.
So, this will depend on the technology you are using in context. But overall, you should point the Ratel to the correct addr with its respective --port_offset.
However, you can try to create an imaginary division within a Dgraph structure. Creating a tree, and relating the data to this tree (and branches). But you would have to deal with that structure by yourself doing some logic by code.
Cheers.