I really don’t think the Zero Surge is right for the Krell. I own a Brick Wall (same design) and the sonics of my 300wpc Sunfire amp suffered. Dynamics were affected and the amp sounded anemic.
These power conditioners use filtering which is excellent for lowering noise on low-current sources, but cant handle powerful amps.
Many manufacturers of these passive conditioners state that they are non-current limiting, but will limit the dynamics of high powered amps.
Look at Tripp Lite power strips.