I have a Deco System M4R, AC1200 and need to buy just one more unit to add to the three I have already. Amazon only sells three packs. Where can I buy this, and is it still available? I did not see my

I have a deco M4 in my basement, another 1 floor up, they connect. A third unit will not connect on the top floor. I did bring it downstairs near the other connected unit and it will not connect, the

I have a whole home Mesh WI-Fi system, as above I wish to extend the signal outside the house. Can I use a TP-Link EAP225 with this system?

I have one of these units on each of three levels indoors. I want to extend my outdoor range, is that possible?