Denon LC6000 - what mixer?

I am looking at 3 or 4 x LC6000 or 2 x SC6000 with one or 2 LC6000 . When used on IOS, what mixer would work nicely with this? I current own Denon MC7000, wich would work fine with 2 x LC6000.
But what 4 Channel DJ-mixers should I be looking at?
PS I have a brand new iPad pro.

Any class-compliant DJ Mixer would work. Some good examples are the DJM-S11 or the RANE Seventy.

Cheers, G