I suggest a physically separate network for ip based security systems. The GPs concerns are also why most wired CCTV at the higher end is often not ethernet, but there are ways to secure ethernet even externally (camera housings that are basically safes, very high placement that would require a ladder to get to, etc)
The term you are looking for is "high-security", which covers the private industry side, DoD has others at play. Also dont forget the value of having custom welding done.
Thanks, my initial search found cameras for oil rigs, which minimized sparks :) I've used carriage bolts to reinforce steel enclosures, with single-use wire rope seals for tamper detection on covers, minimizing exposure of the clamping point.
Axis P1204 has a small camera sensor separated from the camera body by a 25' cable, which makes it easier to enclose and secure the camera body. Not seen that elsewhere, must be a proprietary protocol on that cable, e.g. RPi camera sensor cables can only be a few cm.
i just bought a reolink RLC-823A Smart 8MP PTZ PoE Camera with Spotlights
It is build like a tank and fully aluminium. If you mount it right you easily can hold a person from it. I bascially made a hole through the wall for the cables and mounted it directly to the outside wall.
For now im quite confident that nobody will be able to remove it without much fuzz