As you said, a home has a number of radiofrequency sources—Wi-Fi networks, cellphones and several other devices. The limits established in Safety Code 6 apply to all sources of radiation. So all devices must respect the Safety Code 6 limits. However, I'm not sure if any studies have been carried out to determine the electromagnetic field level in a home with several sources.
On March 24th, 2015. See this statement in context.