Are you using
Blue Iris.
I found that if I use that and Google Remote Desktop I can view the computer desktop running Blue Iris without having to add a forwarding port in my router. That scares me but it does work. I can then use BI to view the individual cameras as well as clips and videos saved. Works for me. And since it's a connection to the desktop you can also log into the cameras separately.
For me the computer running BI has 3 NICs. One connects to the WAN as (x,y,0.z). The other two connect to POE switches that connect to the cameras. They are each on x.y.1.8 and x,y.1.9. A time server runs on the BI computer too and the cameras point back these addresses as the time server address. For time server you may need to allow port 123/UDP to pass in the firewall. I just turned off the firewall for the camera network since hackers would need to get past the first one to get to the cameras.
Hope this helps.