After you have set up your sync with grive-tools, just copy your Goolge Folder to the new desired location and then edit the grive indicator as follows:
sudo nano /opt/grive-tools/grive-indicator
Scroll all the way down until you find the "# Main Env Vars" section and change the googleDriveFolder path. The default is:
googleDriveFolder = os.path.join(userHome,googleDrive)
If you want to put the Google Drive folder under the Public folder you can do this:
googleDriveFolder = os.path.join(userHome,'Public',googleDrive)
You may also just use an absolute path like this:
googleDriveFolder ='/usr/share/locale'
For more information on how to use the os.path.join function, read here:https://docs.python.org/2/library/os.path.html