Yes, the US915 MNTD hotspot auto switch to AU915 when you assert a location in South America or Australia and AS923 in Asia however note we are yet to be certified there.
US915 hotspots will not switch to EU868 or vice versa.
You can check our certification status in this map. Some countries may not require certification but they need to be studied on a case by case basis.
Finally please remember MNTD. only supports hotspots in the regions we sell, we are not able to offer repairs or replacements outside of the regions we sell directly into.