My freezers are pretty full, I keep them at about -5*F...the bottle necks freeze in about 1 1/2 hours...the more you peek the more cold air you loose......the more bottles in there the more you lower the temperature.
I suppose if all you have in the freezer is those bottles you have to compensate.
The last batch we had a bottle that was only half full at time of dégorging...I think the plastic top was split for the wine to slowly leak out. I never saw any wine on the floor, but the paper in there had been wet.
As you do more dégorging you will become less messy....Jim wears glasses to protect his eyes are the wine will burn them...and he does it outside...our house is usually spattered with lees.
We think it it worth the mess.
Have you tasted any????
Hope you enjoy the wine and start another batch right away.