BPT 3.5 & SP Owners

I am considering purchasing a BPT 3.5 balanced power unit. I trying to determine if I can put the BPT 3.5 in my audio room or do I need to locate it in an adjacent room. My primary concern is mechanical transformer hum, because I believe I have dc offset (leakage) which may cause the BPT 3.5's transformers to hum.

So here are a couple of questions:

a. does your BPT 3.5 transformer have any mechanical hum? If so, can you give a sense of how much hum (ie. starts to become audible at 5 feet, or 2 feet).

b. are you running your power amplifiers thru the BPT 3.5? If so, which power amps do you use and do you like the benefits of the 3.5?

c. is anybody using long power cords (10-20 feet) from their stereo gear to the BPT 3.5?

Thanks.