You can also use FMGo on your ios devices.
You can use a script such as OnFirstWindowOpen to switch to different layouts based on device. Most of the starter solutions that comes with FM will has OnFirstWindowOpen Script.
You can have a database that is a dashboard / menu of your databases that you already have on the network or on the device. You would use Open File and Close File. How to create a way to quickly open networked files in FileMaker Pro | FileMaker