It would work but I don’t know what the round trip latency would be like on that Focusrite interface. I use MOTUs (M6 and Ultralite MK5) and sometimes an Allen and Heath PX5. All of those devices have a blazing fast RTL.
Do some research on the interface before pulling the trigger. I’d also recommend an interface with its own power supply. Otherwise, you’ll be drawing power from your iPad for it.
There are also some threads already for iPad audio interface suggestions:
I’m sure there’s others if you use the search feature.