Logistics behind DX12 Multiadapter - What needs to be done by developer?

Development Rendering
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Just curious as to what needs to happen to allow a game to support DX12 Multiadapter / Explicit Multiadapter (EMA) feature.

Given that UT4 is now using UE4.11, I thought it would work “out-of-the-box”, but apparently not.

As I am building my own game using UE4.11, I am curious as to what extra needs to be done to support it.

EMA support in UE was showcased at Microsoft’s BUILD 2015 in April 2015.

Thanks.

I’ve ask this question on the forums as well: Logistics behind DX12 Multiadapter - What needs to be done by developer?