New Post: Can AutoSPInstaller add another WFE to the Farm

In a nutshell, (assuming your first 2 WFEs are called "WFE1" and "WFE2") just search for references of "WFE1,WFE2" in your XML and update them to "WFE1,WFE2,WFE3" and then run AutoSPInstaller on the new WFE. It should pick up its roles/services and be added to the farm.

Or if you prefer you can accomplish the same by loading your input XML into https://autospinstaller.com, but IMO it would actually take longer that way.

Brian