Two - stage camera shutter / convenience key on the lower right side of the phone with volume up / down buttons towards the top of the right side. (bgr.com)
Regarding the Mi Mix 2 S, it is claimed that the front camera will be on the top right side of the phone creating a notch on the right corner. (indianexpress.com)
Located on the lower right side of the phone, you can customize the Convenience Key like you do a keyboard shortcut, to either open an app or complete an action like speed dialing a contact or viewing today's agenda. (crackberry.com)