DeckLink Quad vs. DeckLink Duo

I have been looking for a way to add inputs to Millumin without terminating the thunderbolt daisy chain. Has anyone tried the BlackMagic DeckLink Quad card in an expansion box? Most of the PCIe expansion boxes have 2 thunderbolt ports (eg. Sonnet Echo Express). This might add 4 inputs and possibly 4 outputs too.

Any thoughts Philippe?