Can I use the MultiplayerShootout SteamDevAppId to host for my game?

What I want to do is to create internet sessions for my game to test the game with my friends online. I have heard that using “DefaultPlatformService=Null” will not work for hosting a game over the internet. So I was thinking about using “DefaultPlatformService=Steam” and using the information inside the DefaultEngine.ini of the MultiplayerShootout demo by Epic to make it work. Would this actually work or do I have to get my own Steam dev ID and the steam SDK?

Use Steam AppID 480, that’s the default AppID for testing apps on steam, it’s used by Spacewar which is Steam’s multiplayer example project.