Best security camera system for a 12 unit 3 Story Apartment

[Suzanne Chan]

We're considering putting up 4-5 cameras interior and exterior for our rectangular shaped apartment. It's 3 stories, with 12 units in Kansas City MO. 

Right now we are in the middle of stabilizing this complex and there are a lot of trespassers and un-wanted guests coming in and out. We are in the process of installing a steel door with a lock code for entrance but need a complete security system.

Right now, we don't have internet but we want it to be cloud based, we do not want to have it saved in a DVR. Since we are out of town, our PM and ourselves would prefer to review the footage remotely. We prefer not to have to pay for internet, is there a hot spot or ability to put in a SIM card? Also, this is a C- class property so I am also afraid they will knock down the cameras, does anyone have experience in this or suggestions? I am hoping that over time, we can see who is letting in the unwanted guests identifying the code and also reviewing the camera. 

Any thoughts or suggestions on cameras or companies in KCMO that can install this?