I think this is the core question. @ramkumar will post the set of steps to get you going.
Here is the design doc for it: Multi-Zone and Multi-Cluster YB deployment in Kubernetes
Note the following in case of multi-cluster kubernetes setup:
the clusters have connectivity amongst themselves, that is, the pods in one cluster can resolve the FQDNs of the pods in the other cluster(s)
To answer your question on Yedis:
Yedis is comparable in performance to the other APIs. Simple key-value read operations are generally sub-millisecond. However, note that no active work is happening on Yedis at the moment, please read the note here for more details: YEDIS | YugabyteDB Docs