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I purchased and installed a pair of Deco M9 Plus routers today. They were trivial to install and I'm getting really good throughput in much of my home..... much better than my old ASUS router. However, I have a pretty large house and the basement rooms have very weak coverage. Thus, I'm planning to add another Deco or two. My question is: WHAT WOULD I LOSE BY ADDING M5's TO MY CURRENT M9's. Input would really be appreciated!