My favorite is the Nagra PL-L preamp with all the inputs on the left and all the outputs on the right. Of course, all my sources are on the right and all my amps are on the left and, because it is a tube preamp, I could not really invert it!
Best solution: Face it away from the front of the rack with a mirror behind it! ;-)
Best solution: Face it away from the front of the rack with a mirror behind it! ;-)