Best Practice For Remote Viewing Of 3 Hikvision NVR's Behind Firewall

Greetings. I recently picked up a customer who has 3 Hikvision 7716 NVR's and he wants to be able to view all 3 on his phone.

** Info on setup **

the 7716's each have their own POE switch (16 port) that the cams are plugged into. These are effectively 3 separate networks from the main net that the NVR's are plugged into.

The first thing that seems obvious is to change the ports on 2 of the NVRS so that there are 3 different HTTP / RTSP ports, and setup 3 forwards under NAT in the firewall..

Seems a bit greasy, plus I don't have access to the firewall config, and will have to work with their Network admin to get anything done in the firewall.

It would be nice if the NVR's had an "uplink" port so that multiple units could easily see each other and be viewed from a single address as one.

Another option would be a cloud P2P service, but I'm not sure if the 7716's support that.

So, any thoughts / suggestions ?

thanks much

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