Positioning is a numbers game. You want to think about where play is going and where to get the best view of it - but it's also about what's significant.
The most significant thing that can happen at a corner is a goal. A ball at goal in-out scenario is reasonably unlikely, but not entirely rare - but you can only see it from one position: in line. Similarly, the ball curving out then back in is quite likely - and again, you can only see it from one position. I'd argue that's also a very significant event, as anything that happens after depends on getting this one right.
What else? A foul of some sort. So, edge of PA or behind goal line....they just give you different views. Behind goal line, gives you a closer view, especially if it's a goalmouth scramble. Which, again, is reasonably likely.
BUT - you're looking in from the front and you miss the wide view, so you might miss the shirt pull or holding at the back - but in my experience, the number of times this happens to the extent that I've missed it from this position is extremely rare. Because you're looking back at the players - so your view of these isn't as good, but you can see.
One downside is having to look down the line for ball in/out if it travels down the line, meaning players are behind you. Not ideal, but very rare for something to happen in that timeframe.
The worst case scenario here is if play falls to the far side - then you find yourself quite unsighted. That's about the worst case scenario for me. Whether play stays there or moves further out, it's tricky because to run out you basically need to run out to the edge of the PA then across - you don't want to run across goals (although once I ran behind the goals....unusual, but worked for that time).
What else is quite likely? Play breaking up the field. Sure, you're behind play by a long way. But what happens? Almost always, play is either intercepted by the defence or held up at midfield, so you can catch up. Sure, there MIGHT be a foul - but usually in this case it's so obvious you can see it from 3 fields away. So while you're in a poorer position, you're not unsighted - the number of times I've felt that I missed something on the break in this scenario is very, very low. The worst is if it goes all the way to goal on a sprint and there's a potential challenge near the other PA - because you could be 50 yards behind here. Again, very unlikely and you still have some visibility - as opposed to ball in/out where on the edge of the PA you can't see it at all.
So considering all that, without a NAR I'll stand on the edge of the GA/off the GL , kicker side every single time (being careful not to run across if the corner is being quickly taken). It's just the best option for me - and I always recommend people do the same.
IMO don't stand on the non-kicker side -you're staring at player's backs and can't see a thing. Also have the goal blocking your view of the kick. I've tried it, just felt the view was var inferior. I'll take near post every time. It does mean I have a challenge of trying to look in 2 directions at once for a few moments, but that's very rarely a problem. The angle of view there is just far, far superior.
Standing off the GL does mean you're static - but again, that's not a problem. Why move for the sake of moving if you already have the best view? When I'm standing on the field edge of the PA (with NAR) I'm not going to start dancing around once the ball comes in just for the sake of it. Though, you probably should if you have an assessor, it's the sort of useless thing assessors seem to love
Absolutely, move if the ball/player movement puts the best view somewhere else - but often movement won't be overly necessary.
Personally, about the only time I won't stand off the GL at a CK with no NAR is when the team is so bad that their corners are getting intercepted every single time - or if it's going to the far side of the goal. But bear in mind - even if players are preparing at the far side of the goal, they're going to run forwards.
Without ARs intersection of goal line and goal area is a great place to be before the corner, as you can easily see holding, GK pushes, handbags etc.... but... big but coming... I think it’s a bad place to be once the ball is in play. You can’t see the near post and you have a lot of ground to make up if the ball is cleared.
It’s a compromise whatever you do.
Without ARs the first few corners I start there at the intersection of goal line and goal area, and while the ball is in the air, I move back to the basic penalty area/D intersection.
I learnt this on these boards
You are moving, it keeps the players guessing, and you are better placed for what happens next.
Why do you move?
Personally, I think the priority here of ball in/out very heavily outweighs the incredibly unlikely chance that a player is deciding where/how to foul somebody based on where I'm standing. With a NAR, absolutely, move around (though I honestly think we overstate this issue)
