You don't need to make a reservation, but if you traveling during a busy season, I'd recommend you will make it. It will speed up the drop off, since they'll have all the info before your arrival . Plus you'll know exactly how much it will cost including taxes.
Definitely make a reservation as early as you know your plans so you have peace of mind especially during peak travel times like now. LGA closed one of their lots permanently and their other public lots have been filled daily, so parking has been scarce. Better to always be on the safe side!
I would Recommend at least couple of days specially if its on high season. You want to be able to reserve your spot.
One day is appropriate, if you're considering using the service during high peak travel times.
No need to mske a reservation
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