I don't know of any way to get the SM location data directly, but you might want to look at the Scanning API.
https://documentation.meraki.com/MR/Monitoring_and_Reporting/Scanning_API
Once configured, you can receive messages from Meraki about all devices that are currently visible to your wireless access points. The messages include both lat/long geographic location and x/y position relative to your floor plans.
You will have to set up an application capable of receiving the Scanning API data as HTTP POSTs.