I tried to find to find where characters like »ḋ« are used and so far the only thing that came up was traditional Irish orthography. It seems that for this purpose the preferred position for the accent is at x-height. (The picture is just an example I found.)
However, most fonts place the dot accent higher.
Is there another use for these characters? Or is it safe to assume that the dot accent should be placed at x-height? Thanks!