Elastic Beanstalk Single RDS Multiple DBs Pitfalls?

Are there any pitfalls to look out for in running Metabase, WordPress, and a small database all sharing the same MySql Elastic Beanstalk RDS instance (essentially 3 named MySql databases)? The intention is to have Metabase draw from a small MySql database for secure embedding within WordPress. Noodling thru a bunch of associated documentation it would seem ideal!