2. My understanding is Naomi's amp would work given it's her post count, nothing I've been told contradicts that.
I've already used my amp by the way beforehand with Quick Attack. I usually can't stop things that target me. I had one amp from a top 5 player targeting me, which I used to allow me to stop everything. Then a second amp (mine) to allow me to copy any ability I see, but get a full copy of it so I can treat it as an investigation into itself. Which I used yesterday. I've claimed most of my relevant stuff already, sucker punch roleblocks the next person targeting me with a harmful action, endure protects me from all kills.
BTW Fuji has specifically confirmed to me that only one amp is required for what you said, go ask him if you don't believe me.