How should my dotnet 6.0 WPF application interface with a Mongo database in prod environment?

was thinking of a more solid 3 tier architecture with having my application interface with some sort of intermediary API with Node & ExpressJS, instead of having the bare connection string in the app.config or hardcoded into the application, obfuscating it and praying no one decompiles it into readable code which is obviously not practical but definitely easier