Non technical person here wants to use for 3 sites

Hi. I have a hard time to understand this plugin. I do not know coding and have shared hosting. I was told I could just install the free one and configure by hand. But I don’t know how. I was told that bronze and silver have auto configure interface. And that SILVER is for multisite.

I don’t have multisite. I have 3 separate sites. Can i buy bronze or silver and install on 3 sites?

I also use World fence. Can I use both together? Thank you.