This is in the UK, there are guidelines for how wires cross a wall to outlets, over here you can run wires around the “boarders” of a wall, I think you have 150mm to play with from any corner, and then wires crossing out of that border over to an outlet have to come in at 90 degrees, so for any outlet there could be wires going directly up, down, left or right In the wall behind the outlet.

You could take the faceplate off the outlet and have a look what direction the wires are going, but that doesn’t really guarantee anything. Really there’s no easy compromise, you either guess and go slowly, or invest in a tool that that can tell you what’s in the wall