Yup, you’ll need a separate external interface for it.
You can include Denon X1600 if you’re a windows user (no support for mac after el capitan os), easily beats other mixers on your list in terms of features, build and sound quality.
In your shoes I would rather get something like a Zomo MC-1000, modular will always beat these all-in-one things.
Also, if your software of choice is SeratoDJ you have no other choice other than what’s on the official list of supported hardware.