Greetings!

What would be the recommended extender(s) to work in conjunction with an AXE75 router? 
Currently, my system operates on a max of 500Mps.

My home is a single level, 2000 sq/ft home with a metal roof if that's of any consequence. I ditched the trouble prone  WiFi-7 POS router that Spectrum supplied and configured the AXE75 to my liking. Much more stable and less buggy....so far. I'm not too impressed by the range as the Spectrum one seemed to be better but I will let it ride for a while.  

Thanx in advance!

Bud