I did not mention them and I faced no issues with my application. You don't have to listen to what I said, just read the instructions carefully and you will see that it is mentioned there. Since I was also worried about the stamps on my passport, I explained in my LOE that "the trips between country A and country B, on the given dates are trips between country of residence and country of origin and according to IRCC instructions I don't have to include them in the travel history, so I didn't".
I never faced any issues with the way I filled my application. However, I wouldn't ask you to do the same, fill your the way you feel is best, don't take my word for it.
Good Luck