Help with wiring DSP

Need help with self installation of a DSP.

I had a Hertz amp and speakers installed a couple of weeks ago and after discovering the problem with the EQed output of the factory stereo planned on having an Audison DSP Bit Ten installed. And the government announced the lockdown! So here I am.

I have a Hertz HCP 4D installed in the boot of the car with high level inputs going into it and speaker outputs going out to speakers.

I presume installing it in the rear will be alright. A few questions that I would be grateful if someone could provide guidance on:

a) for power, do I install a distribution box and run power cables to amp and DSP (assuming I add another fuse between distribution box and dsp).

b) then, is it a question of connecting the speaker outs from the headhunt into the DSP and RCA cables to AMP?

The dsp came with this connector with helpful labels on the wires. I presume I can ignore the wires on the connector other than the battery and speaker in?