NVR with good mobile app

Need to install a few cams for an office building that my father in law owns. I would like to use some decent POE cams from Andy. Would prefer an NVR over a BI PC. Looking for something with a decent app. Cloud connection a plus as I'm not sure I'll have access to the network for port forwarding. This will likely just plug into a tenants internet connection. I use LTS professionally but their software leaves a bit to be desired.

I know this isn't the ideal set up. My father in law...

NVR with good mobile app