Yes, multiple replica nodes can be configured for an ApsaraDB for Redis instance. ApsaraDB for Redis read/write splitting instances support different specifications that include one, three, or five read-only nodes. For more information, see Read/write splitting instances.
ApsaraDB for Redis standard mater-replica instances and cluster mater-replica instances are configured with one master node and one replica node. For these instances, the number of read replicas cannot be changed.