The bottom toe bars of the rudder pedals should be aligned with the rudder centered - assuming that both your legs are the same length
I sat in the aircraft with the rudder, rudder stops and cables installed and used big zip ties to take the place of the steel link plates that join the cables to the pedals. I then adjusted the ties until I found a comfortable position that would give me full rudder travel to the stops and that centered the pedals with the rudder. Then I sized, cut, drilled and installed the steel tie plates. The rudder pedals were now adjusted for me.
Next I fitted the brake pedals and angled them so that they wouldn't operate the brakes with my toes on the rudder bars but would do so easily when I raised my feet up and pivoted them about the bars. I then marked the position and drilled the brake cylinder actuation horns on the brake pedals. Every thing was now set.
I also used some big PTFE fender type washers from McMaster-Carr between the pivot surfaces of the brake pedals and the rudder bars. The brake pedals seem to operate smoothly and the cylinder spring seems plenty strong enough to return the pedal. Mind you I haven't flown the aircraft yet!