Power cord length

I upgraded all my power cords to Nordost Red Dawn. My cabinet sits directly in front of outlets. I have McIntosh MC830 monoblocks. Originally I purchased 2m lengths but don't like all the extra cord clutter so purchased a 1m length for left channel amp. After the fact I read Nordost spec sheet which stated minimum length 2m is recommended. Dealer stated "2m works the best for it to really filter". Also, both cords must be same length for "time alignment"; when using monoblocks "different length wires will sound slightly different". I am thinking to buy another 1m for right channel to solve timing thing and additional clutter cleanup. Ok, that's my situation- I am requesting explanations/opinions/knowledge/recommendations-  I read a similar post awhile back and  seek additional clarification. Thank you.