I just purchased this NETGEAR AC1200 WiFi Range Extender - Essentials Edition (EX6120-100NAS), for that same reason. Should be here tomorrow or Monday. I'll let you know how it works. Then Exede route has a very limited range, I need to extend it for an outdoor security camera.
I got my extender and it is doing the job I got it for, I have an outdoor camera aimed at my barn owl box, about 350-400 ft from the exede router. Working fine so far. Would not have had to do this if I could just turn off their router, my netgear router will reach that far, but when you have 2 routers in the system (double nat) it makes it difficult to access the camera from the internet.