This depends on the characteristics of your car park and what has been agreed with the property owner.
Several options are possible depending on the car park. However, this is always clearly indicated in the app, under the parking access remote section:
A complete list of available spots is shown
You must park in one of the spaces displayed in the app. You can choose any of them, as long as it is available :)Free placement throughout the entire car park
You may park in any available space within the car park.Free placement throughout the car park, but with a specific floor
You may park in any available space on the indicated floor.Free placement “Zenpark sign”
You must park in a free space marked with a “Zenpark reserved spot” sign.