Ring stick up cams and TP link N300

Just wanting some assistance please. I have 3 stick up cams two of which have a poor WiFi connection so when I'm away from the house I can't access live view even though notifications still come through. I purchased the TP Link N300, after reading online that it was a good product for the camera. I have successfully completed the setup and the signal strength on the extender is good but the WiFi connection is still showing as poor on my camera. Has anyone had this issue and can give any guidance on what I may have done wrong? Thanks