The article at the link below comes from a local paper in Canada; however, its message is relevant to NZ.

In apartment blocks or a row of units, often all the meters for the complex are on one wall.  If “smart meters” are installed, this means that the person or family whose wall it is has the disadvantage of being exposed to multiple “smart meter” emissions at close range and hence more non-ionising radiation than if they were living in a single family dwelling.  They may be exposed to high levels of the radiation from a neighbours’ “smart meters” even if they have chosen not to have a “smart meter” themselves.