Digigrid iox + D With EX Harware PREAMP, COMP

Hello I have D and IOX

I would like to install a EX Preamp Neve or Camden and compressor for an IOX device in the first line

Also, the D on my Studio desk. I was wondering about converters quality are
If i install EX Hardware Pulteg EQ and compressor for the master

Does anyone have any advice or do I need something else?