What is the exit strategy for escaping a relationship with a mentally unstable woman?

I'm talking someone who is capable of anything, from false rape allegations to death threats.

I've read around a bit and some men have recommended the following.

Fading

Just contact her less and less until it is almost non existent. What if she's a clinger and won't let up?

Ghosting

Along the same lines as fading but just going straight no comms. This doesn't work for a woman who will literally come knocking at your door if you ignore her texts and calls.

Being blunt

Straight up telling her it's over. This is enormously risky when dealing with mentally unstable women.

Lying

Saying you have some business endeavor or something and no longer have a lot of spare time. Lying is problematic because they will always dig for more information.

Going full beta

I'm talking about smothering her with non stop affection and clingy behaviour. The goal is to try and turn her off so that she will be the one to break up with you. This doesn't work when she is receptive to this.

While all of these seem like decent ideas at face value, there is a very complex dynamic when dealing with crazy bitches. I'm talking legitimately crazy. These women will try and destroy your life if you don't exit with a well thought out and executed plan.

So I ask of you, what would your strategy be to get out of such a relationship relatively safely?