Yes all these qulaify
Basically the supported BG has to be at least partly ahead of the supporters, which we measure by extending the front edge of the supporting BG to either side. If part of the supported BG is ahead of that line and other conditions are met it is OK. So it works well in conjunction with the supporters having to be directly behind with sufficient bases.
In the last example if you pvit the supporters about 10 degrees clockwise you would be getting to the limits and drifitng out of support position.
It is there to stop supporters facing backwards - something all you comp die hards would realise to be very attractive if allowed as you could run away if your front line started to crack...!!
Without such a point you will get HF warriors deployed facing backwards which would be about as realistic s a Serbian general releasing his knights and running for the hills (not that we have ever done that

)
Si