I paid a premium for an (under)board-friendly mixer, with a basic set of features.  But it’s augmented by some convoluted rack routing, plus an ancient line mixer.

RJM Mini Mixer:  https://www.rjmmusic.com/mini-line-mixer/

Fostex 2016 Line Mixer:  https://www.musicgoround.com/p/384960/used-fostex-2016-line-mixer