A:AnswerI've got a different motherboard but looked up the specs of your motherboard. it should fit just fine. I have gigabyte b450m ds3h and it fit fine on it.
A:AnswerIt will fit with most 2 slot gpus just fine, and the size once installed won't pose any serious issues to the fans(it may slightly cover a small piece of one.
A:AnswerIt is for wireless internet, so no. You would need either the wireless adapter that came with those devices or Bluetooth if they are compatible.
A:AnswerIt’s WiFi 6.
However, I would not game with a wireless router. I am hardwired to my modem/router. I want my lag time as close to zero as I can be.