We used to have a song for "sur sous dans, devant derrière" in elementary school, complete with hand motions, and it helped with memorization ( i may or may not still use this song sometimes to jog my memory in high school french class)
Primary French Immersion Resources: POMMES for editing our writing.I LOVE this as a grading code for my middle schoolers, but change the P to pronom, as they have punctuation down, but still make lots of pronoun errors.
I am a grammar nerd. It goes against everything I do as a teacher, but I love it and it's how I learned French. Now I teach using TPRS with whole language chunks and rarely do any explicit grammar teaching