iPhone 15 Pro Max Best way to track stock at apple?

[ac921ol]

What sites are people using to track inventory? Looking for a 15PM and all I keep seeing is 15P on apple

 

[sparkhill]

Inventory Watch

 

[tekchic]

I get up pretty early so I check the Apple Store directly for my configuration around 5:30 or 6am. Also this site: https://iphonechecker.herokuapp.com/

 

[GDF]

Inventory Watch

So, is there a way to set this up with an iPad or iPhone or you have to setup on the Mac first? Looks like you get one free device to save and get alerted on? Thanks!