I do as posted above by KimKats .
I do though plug return and cover plate the skimmer, with all the snow and freezing winter rain we can get up until spring, usually water level will be over return level and mid way up skimmer opening, but then I don't cover the pool at all, way too much work in the past removing snow drifts off cover after every snow fall, but don't have any trees that close to drop leaves into it. I usually close around 3rd week in October, that's when water temp stays below 60 but this year looks like it might happen next week already.
I also put a plastic water bottle, half filled with RV coolant into the skimmer, I have noticed once while checking in the winter, some water was in it and frozen, not plugged, as not able to drain out lower opening but worried me it might . Those skimmer plate covers are not 100% going to stop seepage of water if the level gets that high from rain / snow
I would lower below return 6 inches, what's a little more water and not have to worry.
And just a little more info, I also store sand filter indoors now with the other equipment , they never really dry out no matter how long you drain it.
Mine was only 3 years old and next spring when opening pool, started pump and it split on the side, not sure if defective tank or just moisture residual froze in it, I did have the port valve off and opening very well covered.