What is your practice in positioning mark anchors? Do you set them on the baseline/x-height/cap height, or slightly below/above?
This will probably depend on the design, but generally, do you adjust the position to overshoots?
One thing is that placing the anchor over a node hinders its selection (in FontLab and FontForge, at least). Placing on height different than a guideline implies having to remember or check what the height should be (or adding a new guide...).
So I place the anchors on x-height/cap height/ascender height, baseline, and descender line mostly, and design the marks as though positioned over an x-height letter or below a non-descending letter for bottom marks. If your approach is different, what are your reasons? I think I've seen fonts with the anchors mid-way between the letter and mark, are there any particular merits to such approach?
Lastly, does the chosen strategy affect the final result for different base and mark combinations?