[Zenfone] Where is the NFC sensor installed on ZenFone 4 (ZE554KL)?

The NFC sensor is installed under the upper-left corner of the screen as shown by the red square in the picture below:

 

Where to sensor/scan your card:You can place your card along the top edge of phone panel.   

To do the card scan/sensor, you can place your card near the edge of the screen or scan it from the uppe left corner of the screen.