Organizing Components on Rack

[RDSChicago]

I have a two-shelf rack wide enough to hold three components per shelf. I also have separate stands I can place in front of the rack for amps, etc. I have several DACs, amps, preamps and speakers. If I want to switch components out occasionally, how would you recommend I set up my rack/amp stands for purposes of efficiency, ease of access, etc. Thanks.

 

[Speedskater]

Things to watch out for:
a] Big power transformers near sensitive input stages.
b] Big Switch Mode Power Supplies near digital circuits.