To publish a survey on multiple channels at once, You must create a 'Feedback Kiosk' channel for each of the iPads. Meaning that you will have to create 10 kiosk channels if you wish to publish a survey on different 10 iPads.
1. Go to the 'Channel Management' tab.
2. Create a 'Feedback Kiosk' channel for each one of your iPads
3. Create a survey and publish it to all of your newly created Feedback Kiosk channels in the 'channel selection' tab
4. Go to the channel management tab and click on each one of your newly created Feedback Kiosk channels to find the authorization code for each one