Adding changers (CDP-CX350s)

I currently have 2 CDP-CX260s connecting to a Slink-E, and via an audio mixer to allow crossfading via CDJ.

I am thinking of adding the recent CDP-CX350 (possibly 5) to this setup. Would this present any problems?

Furthermore, would the forthcoming DXS help in such a setup in that will it crossfade automatically with the 7 changers (1 output via TOSLINK to my AMP I presume)??

Any help or feedback on this proposed setup much appreciated.