There is no such "right place". As I already explained, it's totally different if you're pulling it out of your pocket vs. picking it up from a table. Vs. holdi

There is no such "right place". As I already explained, it's totally different if you're pulling it out of your pocket vs. picking it up from a table. Vs. holding it. I've had devices with fingerprint sensors on the back and on the edge. My finger is never naturally "just there". Even pulling it out of my pocket, where it comes the closest. Most importantly, my finger does not sit on the fingerprint sensor the entire time I'm using the phone, the way my face is nearly always visible to it when authentication is necessary.