"Now, the 30amp outlet plug is different shape than the ordinary 20amp?
I used 20 amp receptacles. 10 years with no issues. The extra amperage is paramount to adding headroom in my mind. Instantaneous peak current draw is what we are looking to address, so very little risk of overloading a good 20 amp receptacle due to millisecond current peaks.
"As for not going through power conditioner, let’s put aside sound quality but safety?"
Safety? If you mean surge protection, IME conditioners with surge protection that don’t limit current are expensive. Since you are starting from scratch so to speak, investigate addressing surge protection at the breaker box per another recent thread here. No conditioner will protect against direct lighting strikes and the whole surge protection concept is best addressed at the breaker box IMO.
"Some amps draw so much power that condition may actually do more harm than good to the amp? Is this accurate?"
I would modify that statement to say that "Some amps draw so much power that some conditioners may actually do more harm than good to the SOUND."
I have used many high-current amps plugged into my SR Powercells and find that the sound is better than way, with no constriction of dynamics . Other conditioners, but not all, limit current so are best bypassed with amplifiers. Another recent thread on this here as well.
Best to you gr,
Dave