how to connect to use rekordbox dj

how to connect all those devises to use rekordbox dj!!

Hi guys Iam new to this so please help me

I do have a
2 x CDJ 2000 NEXUS
1 X DJM 900 NEXUS
Want to use them with rekordbox dj!!
And have question regarding how to connect all those devises

Connecting option NR 1 true USB cables
i thought like this

connect my two CDJ 2000 NEXUS whit the 2 different USB cables in to the two available USB ports in to my computer!
Connect the DJM 900 NEXUS whit the USB cable in to the available USB ports in to my computer

It is that so simple to connect them all?
to have full function with rekordbox dj? OR did miss something?

Thanks you for answers