I agree with Dave in that there is no such thing as a 100% safe rig. But I reckon the safest rig you can get is one that uses a running lead and a hooklink that is weaker than the main line. Combine that with a barbless hook and that's about as safe an anti-tether rig as you can get.
(The virtues or otherwise of barbless hooks is another issue)
Yes, I have used rigs with stronger hooklengths than the main line, fixed paternoster rigs for bream, etc, But I'm not one for preaching anti-tether this, anti-tether that, every time I spot something that could possibly cause a slight problem.
Like most pike anglers I used wire traces that were stronger than the main line, and plenty still do, but now I use braided main line that is stronger than the wire trace.
The only way we can keep improving is by debating these things, but I really dislike the preachers, who we've had on this site from time to time, who prowl the net and the fishing journals looking for anti-tether rigs (in their opinion) and other rigs that could, possibly, cause a problem.
We often take these things too far, and handicap ourselves uneccessarily. In other countries they laugh at us for no matter how far you take the anti-tether thing, barbed/barbless hooks, and other contentious, similar issues, you will never, ever, escape the fact that all of us stick hooks in fish and haul them into landing nets.
How is it we can get heated debate about anti-tether, etc, and still do that with no conscience at all? How do we reconcile that one and remain logical?
Sometimes I wonder where some of us are coming from.