For what it's worth I've been using the Behringer XR18 18in/8out fairly successfully. 
There is a native version of the app, it connects over the network.  
A lot can be controlled through osc and midi too. 
I managed to find a used xtouch as well that has 9 motorized faders and a bunch of controls, network, usb midi and din midi.

It's a bit lite on documentation but there's a large enough user base to usually solve problems.

I'll have to dig around for the list of osc command somewhere.

The on board effects are ok two, so sometimes I send everything from the DAW onto usb channels and mix in the XR itself.

Hope this helps!

John
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