On Oracle RAC, the same volume can be accessed by several nodes at the time, which is not supported by any of the target cloud providers.
Generally for Disaster Recovery, Oracle RAC is not supported for replication.
For Migration purposes, Oracle RAC can be migrated but it needs to be configured as single node during the migration replication process.
Ensure that only one node is up prior to installing the agent on and this configuration is kept until the cutover. It is important that the other nodes are shut down, as the DB on them may continue write to the shared storage even when not serving any requests.