pianoloverus I think grace notes are always printed before the beat. If I'm correct, then where they appear visually on the page is never relevant.
This is correct: it's a convention of music engraving to print grace notes before the beat, but whether they are actually played on or before the beat depends on style and context.
There's a general approximate rule (not to be slavishly followed!) that grace notes are played on the beat in baroque and classical music, and before the beat in romantic and later music. In this case we have a 20th century composer conjuring up an 18th century atmosphere. In order to give this piece the necessary baroque poise and elegance, it's better to play the grace notes on the beat.
I can think of no better example than Vlado Perlmuter, who studied all of Ravel's solo piano works with the composer himself.