Netgear AV 1000

I have three floors in my house.  In the second one I have alreay plug a Fastweb Fast Gate Router to the NetGear 1000AV Power line main adapter through ethernet connection .  The secondary adapter id plug into an eletrick sock at first floor and it works perfectly . Now I need to have WI FI working also at the third floor :  since it is impossible to buy a single secondary plug  ,if I buy a new set of two Net gear WI FI 1000AV devices , does it work if I plug such  secondary  adpater to my electrical network ?