sully&red

Hi All, This is my first time on the forum and my first time installing CCTV. So i apologise in advance. I am installing a 4 camera set up on my home and its a 3 story house. The only option i seem to find for running cables is from the outside, Will this be an issue? My next question is does anyone know if the DVR DS-7200 is wifi enabled or does it have to be hardwired? Any tips or tricks will be appreciated. Thank you