2017 Hatchback Sport Touring - 10 speakers, X channels to Soundstream ST4.1000D ?

[Synomenon]

I'm mulling upgrading the speakers and sub. and replacing the factory amp. in my '17 Sport Touring.

If I understand correctly, it has 10 "speakers":
- FL tweeter and woofer -> 2
- FR tweeter and woofer -> 2
- RL tweeter and woofer -> 2
- RR tweeter and woofer -> 2
- Dash speaker -> 1
- Subwoofer -> 1

That makes it a 10-channel system right?

If I use two of these Soundstream amps.:
www.crutchfield.com/S-KYHQaXe5jAT/p_530ST410KD/Soundstream-Stealth-ST4-1000D.html

I would get only 8-channels, BUT if I replace the stock FL, FR, RL and RR tweeters and woofers with component sets I'd still be able to connect them all because with these component sets, the tweeters and woofers connect to a crossover THEN the crossover to the amp., right?

So:

FL tweeter and woofer -> crossover -> Soundstream FL
FR tweeter and woofer -> crossover -> Soundstream FR
RL tweeter and woofer -> crossover -> Soundstream RL
RR tweeter and woofer -> crossover -> Soundstream RR
=======================================
Soundstream amp. #1





Dash speaker -> Soundstream (which speaker out on the Soundstream would this connect to?)
=======================
Soundstream amp. #2


That leaves the dash speaker. What would I connect it to on the Soundstream?

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[Synomenon]

I understand I'll also need one of these to make any of this work?

Axxess AXDSPX-HN3
https://axxessinterfaces.com/product/AXDSPX-HN3