Schiphol Smart Parking - Lang Parkeren
https://www.parkerenschiphol.nl/aanbieders/schiphol-smart-parking
We have
already made use of this parking facility at Schiphol several times.
It is located on P3 and is already signposted from the
highway. It is a huge parking lot with a shuttle
bus to and from Schiphol. You will be dropped off in front
of Schiphol at the terminal where you need to be. We have
never had to wait long, but we have never gone in high season.
The only drawback I can think is
that you sometimes have to walk a long time from the car to the shuttle.
The price is ok. There are cheaper
providers, but I don't know how reliable they are.
And they are often further away from Schiphol.