Prioritise Wi-Fi over GPS Location on iOS
On the Meraki Dashboard go to Wireless -> Configure -> SSIDs and click "rename" under that specific SSID and make sure that it's set exactly as your other one from your downstairs and hit the Save Changes button. Then click on the "edit settings" button and mimic the same authentication settings as that one and that should cause your phone to roam from one to the other on the same band but what you do want to make sure is to go into your Radio settings menu on the dashboard and assign the upstairs AP a different channel as your downstairs so that it would roam seamlessly