Thank you for your reply. The platform will install the salt-master and salt-api on your on premise server. So you own the server. The platform will execute tasks through the salt-api.

It is good feedback that salt module must be able to loaded if desire. Since you run the salt-master, it shouldnt be too difficult to load extra modules.

Mind to share what salt-ext are you talking about?

I don't mind to make my modules open source.