There is no limit for the number of ARK servers, that means you can include all ARK servers running on the same root server.
The program currently can't update the ARK Server API.
You don't need a MySQL server for the program. The only requirements are Windows as operating system and .NET Framework 4.7.2.
You can simply download and install the .NET Framework, it doesn't require any additional configuration or anything like that.
Download: Microsoft .NET Framework 4.7.2...