American style motel in netherlands

American style I don't think that even excists here in the Netherlands.

I checked on : https://www.booking.com/motels/country/nl.nl.html but nothing american style as you descibed

Bij vd Valk een begane grond kamer nemen, dan kun je van buitenaf naar binnen.

I don’t know about an American style motel/hotel but I do know about a hotel with a back entrance where you can let people in without going by the reception.
Thermaalbad en hotel Arcen. They have a parking lot in the back with door.
I am sure there are more hotels like this.

vd Valk Nuland Buitenkamers

Look for a B&B, otherwise a small appartment of bungalow at Centerparcs or Landal.

Or check secretrooms.nl. Very discreet.

In Belgium there are rooms where you park the car in an indoorgarage. Door shuts behind you. The room is upstairs.
very private. The checking in and out is still quite public, on a major road. Would have been beter if these locations where of road.

Ik ken er 1tje in terheijden, op ongeveer 1uur rijden van Eindhoven.
https://texasbarandgrill.nl/tiny-houses/
Maar je kan toch op een vakantiepark gaan slapen?
https://www.google.com/maps/search/vakantiepark/@51.4599917,5.5093692,12.33z?entry=ttu

A little further in the direction of Breda, hotel Gilze (van der Valk) has large rooms at the back (ground floor) where tou can park your car. They also have appartment like rooms, those are more recent.
In the other hand: Hotel Eindhoven has an entrance that is not facing reception where you can catch the elevator in 10 meters from the entrance. It's so crowded they won't pay attention to you.