First time 3-way active crossover with class D amp boards

Hi everyone,

I want to use class D amplifier boards to build an amplifier to power a pair of DIY 3-way towers using a MiniDSP 4x10HD as an active crossover. I'll be using a Sure 4x100W board for the mid and highs and a Sure 2x 200W board for the bass drivers.

Sure Electronics AA-AB33184 4x100W TDA7498 Class-D Amplifier Board

Sure Electronics AA-AB32281 2x200W Class D Audio Amplifier Board - T-Amp

Can anyone who has done something similar give me some tips? e.g. Should I or can I include a volume knob or just leave that up to the miniDSP?

The manual for the amp board says 'never equip a pre-amplifier to the audio input'. Wouldn't the MiniDSP be functioning as a pre-amp?

Thanks for you help, let me know if I'm in the wrong part of the forum