I think the answer is: where they can't easily access & control.
I would avoid using their technologies/infrastructures, or avoid using technologies they understand & are familiar with.
The technology part is why I'm seriously considering things that are open source & decentralized... both in hardware and software areas.
I wouldn't be running away from things they control in one country and going to another country to live where there are infrastructures/technologies they can potentially control
It is impossible to hide under anything in this world, probably on Mars?
Why we need to hide and survive from who? Talking about skynet?
I assume you think everything on earth is (or will be) known and understood by the dictators\tyrants?
Well, there are people who will be kept safe during their tyrannical reign and safe from the problems people will be plaqued with on earth. An invisible LORD who made this World will keep them safe. HIS name is JESUS CHRIST and HE is a Good LORD. Any one who believes in HIM will be kept safe too.
Ofcourse, there are believers who will be killed when their time on Earth is up. Others will be be "taken away" alive together with the killed believers.
Why we need to hide and survive from who? Talking about skynet?
I don't really know about skynet, maybe I have watched it before but don't remember anymore. This is about very reliable prophesies about what will take place on earth in a not-too-distant future. It's gradually being fulfilled in this world and has been very reliable.
I believe those in position of authority, researchers, and others are aware of what is going on and have developed/developing plans to counter it. Unfortunately this will only lead to drastical changes that will end up getting mankind more enslaved to an evil entity. Besides they won't be able to solve the problems. It's way beyond them.