Remote Viewing Without A Public IP?

Hello everyone, I've been looking for a solution for customers to be able to connect to their Windows NVR's when their ISP does not provide a public IP. In rural areas where I live a couple major ISP's don't offer a public or static IP option, instead handing out a 10.x.x.x address and sharing the public address with most likely hundreds of customers. Any services or options that someone might be using to get around this? Not looking for remote desktop or anything like that, more like a cloud service that a phone app could connect to, then to the required ports on the NVR behind the double NAT. I thought of setting up a L2TP over IPSec VPN router at another location with a static IP, and having the NVR's stay continuously connected to that VPN via Windows built in client? Tried something called SoftEther VPN with the cloud service vpnazure.net, but only got it working on LAN, cloud part wouldn't connect, thought that may be the answer. Anything else like that out there?

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