Your subscription allows you to use multiple different instances of Fiddler Everywhere on other devices with the same account. We are not restricting downloads from the same external IP (you can also safely use the same installation package). Each Fiddler Everywhere instance will work on a different local IP address, so that is also OK. If you plan to capture traffic from a remote device, you need to consider that each separate Fiddler proxy will work on its different local IP.

The only functionalities that will be limited are the collaboration /sharing abilities - you can't share directly to yourself, and local collections needs to be uploaded to the cloud and then downloaded (to be reused from different instances).