With all due respect to the comments from "paranoid" users like myself
, the fact that you are asking this question indicates that you don't have what it takes to do any of this, an easy option would be buying a cheap PC , place it in your farm, install Linux OS on it , download TeamViewer on it and access the miners through TeamViewer , yes there are more secure options , shorter paths, but if you want a mixture between easy and secure then this is a perfect combination.
The solution above also cancels the need for a public static IP , which in many countries cost a fortune, most of the comments above require you to have a static IP, using TeamViewer you don't need a static IP and can just use whatever connection you got.