mordents above and below diads

[mike2aces]

Dear fleet fingered fanciers of Fidelio and Florestan:

I am working on Menuet and Trio in B minor from French Suite 3 by JSB.
In measures 37 and 38 of my score, (RCM Grade 8 repertoire 2015 edition), there are two different 2 note chords. (diads?)
One has a mordent above the notes, one has a mordent below the notes.
Does that mean that I should execute the mordent on the upper note in the first case and on the lower note in the second case?
Any light you could shine would be much appreciated.

Peace.