Can I Request Multiple Read/Write Splitting Addresses for My RDS for MySQL Instance?

Yes.

When single-proxy is enabled, a read/write splitting address is automatically assigned. Write requests are automatically routed through the read/write splitting address to the primary instance and read requests to each read replica by user-defined weights.

When multi-proxy is enabled, you can create multiple database proxies. Different applications are connected to different proxies, and proxies are associated with specific read replicas. In this way, read requests from the applications are forwarded to different read replicas, keeping application workloads isolated from each other.