I think it depends on how you fly the approach. If you are intending to fly level at MDH/A (until the MAP) then you do not need to add an allowance.
However, if you are flying a "stabilised" approach and are intending to immediately Go Around on "approaching" MDH/A then, yes, you should add the aircraft allowance.
In either case you should, obviously, not got below MDH/A without the required visual reference.
Hope this helps.
------------------