The tonos is used in the Greek script to denote stressed vowels. It is placed above some lower case letters and to the top left of the same upper case letters.
Is the placement to the top left of upper case letters to avoid collisions with the descenders of the letters on the line above or is it a cultural thing ?
The significance of this is that I am doing small capitals for a Greek script. There is room above the small capitals for a tonos. If the reason for the placement is to avoid collisions then this would be appropriate but if it is expected by Greek speaking people that the tonos would be placed to the left of a capital letter coming up to the Cap Height then it would be inappropriate to place them over the small capitals.
I have looked at several fonts but there seems to be no consensus on this.
Please advise me, especially if you are Greek.