Need Cameras but cant get wifi as an unoccupied landlord

Hi All,

Dilemma here......I have finally got all 3 floors in my 3 family rented...only issue now is the amazon blink system i have for cameras requires wifi...comcast (only provider in area) wont provide me with a plan because i dont actually have an address there if all 3 floors are occupied. What should i do?.... change to a system that does not require wifi? Does that exist? Is it even good?... Ask a tenant to use there wifi? Help! Thanks.