A:AnswerIt connects to your wireless network and retransmits the signal to extend the range. It is compatible with most any wireless router or access point.
That being said, this MAY be over kill. This unit supports the AC protocol - with can be faster than the "n" protocol. I don't know if the r6250 does.
A:AnswerYes, you enter the passwords for the EX7300 to connect to the main router you wish to extend and there is a second page where you tick the box to use ONE wifi name for the entire setup. Then you may move throughout your home on the same SSID seamlessly.