Databases don't live on nodes. They re on shared storage. The instances run on particular nodes.

Don't use the term active/passive. It's misleading and out of favour. What you are describing there is a mult-instance cluster, 2 nodes and 3 instances.

In that config, 2 instances on one node and one on the other or all three on one node. If a node fails, any instances active on it will fail over to the other one.