Optimally, all cables should be as short as possible to eliminate possible capacitive, resistive and RFI issues. Having a tall rack between the speakers however is also not a great thing. In my opinion, having the monoblocks close to the speakers with a 6-8ft run of speaker cables is optimal. Next is the issue of where to place the preamp. Remember that the cables after the preamp have an attenuated signal as compared to the cable before the preamp (sources) and the signal is more fragile. So, it would also be optimal not to have the preamp too far from the amps. Running long "balanced" cables from the sources to the preamp/amps would be OK, except that not all gear is balanced nor does it always sound best "balanced" depending on the design. There may also be an issue with the phono if it is balanced or not and how long those cables are.
All things considered, short/wide racks on the front wall would seem like a good compromise followed by amps/preamp over by the speakers and as is often the case, sources/preamp feeding the amps with long balanced cables from the side walls.
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