Below you can find some additional information on an io6 upgrade for a 2015 Colorado/Canyon.
The picture above shows the location of where the HMI module is located.
The picture below shows a 3D model of the dash as a reference point.
Attached are two PDF files that show some additional information about the unit.
The first file (INST95) should be used as a reference point in assistance in removing the dash,
while the second PDF (2015MyLinkDetails..)simply shows additional information about the io6 module and it's capabilities.