Sometimes I find it useful, as an exercise, to look at things in such a way that it sweeps aside perceived barriers. Right now, it 'sounds' to me as if there are a few of you making these decision/plans and for whatever reason you're paring everything down to the absolute bare essentials.
What about this - ask yourself how you'd solve this IF the barn of equipment were 20 feet away, and you had gobs of power outlets, a strong internet signal and so on. Now picture yourself, or the others sitting down wherever they may be, whomever they may be and being able to monitor the equipment. And here's the wrinkle - one of you sits down and logs into a camera and sees $100K in equipment gone. Now what? No NVR, no NAS, no
Blue Iris, so no recordings of the crime taking place.
Why monitor or have the intention of monitoring valuables, if realistically you will be fast asleep when it goes down?
I'd step back and break the challenges down. It's all easily within grasp, and these guys can help you sort through it, but you should begin by breaking down any barriers and asking yourself what solution looks best. Maybe not the ultimate solution, but one which is highly functional for every user involved. If the internet access is the biggest barrier, then solve that challenge first. Once you do that then look at involving hardware to record, and a means for all of you to log in randomly to check on any activity. The software used in those solutions will already break up your screen so that all 4 cameras are visible at once, or whatever permutation of views you'd like. But then you can all go back through a timeline to forensically audit any crimes which take place, rather than standing in the barn with a lump of regret in your throat.
I am damned new to this, and have an incredibly humble setup but my wife on her android tablet and myself on my Macbook can easily log into my modest NAS to view the feed(s) live, or to check out the nights recordings etc etc. We can also just cast the feed screen to our smart TV's if we want to have it on in the room while we do other things.
I say, research, ask a ton of Q's and swing for the fences. It will be worth it in the end.