ADE7880 Vn design

Hi,

VN input terminal is connected in series with 499K ohm * 2pcs, will it affect the measurement accuracy and how to calculate it.
Does ADE7880 can support 1P2W-1CT, 1P3W-2CT, 3P3W-2CT, 3P3W-3CT, 3P4W-3CT wiring methods?
 
Thank you~