Yes I'd agree with that but from someone who's come across cables going in expected routes to then find they suddenly go off at an unexpected tangent, (i.e. cables start going horizontal to what you believe is the socket further along the same wall, so you go to mount a cabinet where you now think it's safe to do so only to discover that of 2 cables running together one has gone off at 45 degrees into a corner recess then vertically to disappear into the ceiling void right where you have just decided to drill!), so from a personal point of view for me it's either straight up/down or in line horizontally without going round corners. Also bear in mind a corner can be a very tight radius.