Garage might get too hot in summer time for the HW, no?I'd put your server rack...in that little nook in the garage.
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Figure out a way to insulate/air/ac that little nook. That nook will be mostly useless, other than storage. Run all your drops there.
Your house isn't very big and every sq ft of interior space will count in the future. Oh, and server racks and servers are noisy... You'll keep pulling your hair out trying to make it quiet.