I think I would prefer having the inputs on the left side of the potentiometers, not toally sure though, right side could also be handy depending on where it is positioned in your rack
A four channel mixer with integrated white noise
https://www.hissing-wombat.de/products/ziggy-4-channel-mixer
I think I would prefer having the inputs on the left side of the potentiometers, not toally sure though, right side could also be handy depending on where it is positioned in your rack