As I mentioned to you in the other thread, do not chase 4k - at night the 1080 (2MP) cams will be your better bet. Just ask my neighbors with their 4k cameras that didn't provide the money shot to get their stolen belongings back, yet my older 2MP camera did capture the money shot that ID'd the thief for the police to find and make an arrest and fortunately still had all the stolen stuff...If you have a lot of light, and I mean a lot of light, then maybe 4k, but most of us do not have enough light for 4K.
Also, do not be sold by some trademarked night color vision that is a marketing ploy in a lot of ways lol. It is simply what a manufacturer wants to claim for low-light performance, but there are so many games that can be played even with the how they report the Lux numbers. They will claim a low lux of 0.001 for example, but then that is with a wide open iris and a shutter at 1/3 second and an f1.0 - as soon as you have motion in it, it will be crap. You need a shutter of at minimum 1/60 second to reduce a lot of blur from someone walking.
Hikvision calls theirs ColorVu and check out this video at midnight. You see this and it looks like daytime. But any motion in the frame and it is crap and will be a ghost blur. You notice they do not show anything with motion. I can make all my cameras look like this at midnight with no other light, but we want good motion video, not still images video.
It is these games that the consumer grade cameras of the world (rings, reolinks, nest, arlo, etc.) do to their camera to make it look good at night - but then a person walking by is a blur and people simply say well the camera isn't good at night. If you have the ability to change the settings, you can make it work. Just remember that every increase in shutter speed needs more light. So I can set mine to 1/250 second and eliminate blur at night, but then all that is visible is a 5 foot diameter around the camera IF I have enough light.
Here is another example from a camera manufacturer marketing videos - do you see a person in this picture...yes, there is a person in this picture. Could this provide anything useful for the police? The still picture looks great though... Will give you a hint - in between the two columns:
Given that you are trying to cover a rental storage area, you will end up wanting more than 8 cameras. As I mentioned on that other thread, 2.8mm or 4mm lens will only be beneficial if the unit is within 10-15 feet of the camera, so you will need more cameras and/or varifocal cameras that you can zoom into different areas.
Maybe even add a PTZ with autotrack that has a preset cycle it goes through and then can zoom in and track when it sees activity.
But without seeing your layout that you are trying to cover, all any of us can do is guess. But if the two buildings are situated such that they are on either side of a single pathway in between and all the units access are from this common pathway in between, then a PTZ on either end may be the better option.
Regardless, I strongly suggest getting an NVR that has more available cameras to add, or go with
Blue Iris that you can add up to 64 cameras to as needed.
Maybe post a Google map of the area you are trying to cover and we can offer up some suggestions.