The CP2102-GM datasheet specifies three options for pin packaging for the QFN28 device (taken from CP2102 datasheet, page 12:
Although Silicon Labs CP2102 devices are generally shipped in the leftmost "Option 1"/"Irregular Corner" option, the other options are included because Silicon Labs reserves the right to ship these devices in any of those package varieties.
Regardless of the Pin 1 marking option used in a given device on the bottom of the device, the PCB landing pad configuration is the same for all CP2102 devices, and is given in the datasheet on page 13:
Interface Knowledge Base
CP2102 Pin 1 Identifier and Packaging Options
The CP2102-GM datasheet specifies three options for pin packaging for the QFN28 device (taken from CP2102 datasheet, page 12:
Although Silicon Labs CP2102 devices are generally shipped in the leftmost "Option 1"/"Irregular Corner" option, the other options are included because Silicon Labs reserves the right to ship these devices in any of those package varieties.
Regardless of the Pin 1 marking option used in a given device on the bottom of the device, the PCB landing pad configuration is the same for all CP2102 devices, and is given in the datasheet on page 13: