If I am following your plan correctly - all 10 IntesisHome devices will be (are to be) controlled by the DellEdge gateway instead of the mobile application device. To do that you would need to set up all of the devices via the browser on the DellEdge Gateway per the User Manual.
Then you wish to control the DellEdge gateway via the mobile app device - do I understand correctly?
What you will need to set up is a remote desktop connection from the device with the mobile app so that device can access the DellEdge gateway as if you were sitting at the DellEdge gateway.
For that you will need something like this:
https://get.gotomypc.com/mobile-apps
If you google (as I did) the following words "remote desktop mobile app" you will find...