First option (ground floating) is actually quite common: A Class II or double insulated electrical appliance is one which has been designed in such a way that

First option (ground floating) is actually quite common: A Class II or double insulated electrical appliance is one which has been designed in such a way that it does not require a safety connection to electrical earth (ground). [1] [1] https://en.wikipedia.org/wiki/Appliance_classes#Class_II https://en.wikipedia.org/wiki/Appliance_classes#Class_II