Subwoofer build, anything I’m missing?

I already purchased a 220 amp alternator to power the subs, they also have this on their website: https://www.powerbastards.com/proddetail.asp?prod=PB-1001-01

Do I even need it?

What I have so far:
https://www.ctsounds.com/products/ct-2000-1d-monoblock-amplifier?variant=34758381207707

3 of these: https://www.ctsounds.com/products/hydro-10?variant=43964675293339

https://www.powerbastards.com/proddetail.asp?prod=13794-220-HD1-2

And this amp…

Subwoofer build, anything I’m missing?