It is important to keep in mind that once you find and hack your target, you have 60 seconds to initiate the hacking process. Once you do that, you must remain within that radius until the hacking is complete. That is your chance to find the best place where you can conceal yourself.
I happened to get on a freeway and begin the hacking there - as shown in the video I posted below. I also posted another video that demonstrates those more pesky scenarios where the player hides on top of a structure - that can present a more tricky situation.