skylight flashing

this is one for the roof plumbers out there. when installing a skylight on a corrugated roof should i nib the front of the skylight flashing to sit in the corrugated groves. At the moment the skylight flashing on the front is just a straight piece. im not to concerned about the rear of the skylight beacuse it will be backflashed, but i am curious even tho it will be backflashed should i nib the back of skylight flashing to sit in the groves aswell and then put the backflashing on. was just worried if i nib the front and not the back it might make the skylight sit on an little angle


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