Depends if all your devices are on the same network. If they are all connected you should be able to install QIE on one server and setup multiple channels as needed. If they are not on the same network then you would need multiple installs for each device.
For licensing we allow you to split the channels on a license across multiple instances of QIE. We are happy to find the best solution for you just email us "support@qvera.com" or give us a call on the support line 801-337-5101 Ext 2