You shouldn't expose any of these cameras, high end or low end, to the internet. You shouldn't even trust them on the same VLAN as the rest of you computers or phones. That mitigates security issues.
In larger installs it’s a VRF dedicated to the camera subnets and a similar dedicated NIC arrangement on the server.
Nothing should talk to the cameras except the recording server they’re streaming to.
Annoyingly, few TVs have multicast receivers, it's all Chromecast etc, so you need your own computers to decode and display.