connecting AC1200 wifi range extender to powerline AV 200 wireless extender

Thanks for your response. Yes, it is an old home (1939), brick with plaster walls, and mix of old and new wiring. Since my post, I contacted Verizon and their tech said problem could be my old Verizon router, now more than 12 years old. We worked out a deal that they will replace the router with new model, as well as my 3 cable tv boxes, and waive the installation fee. Monthly fee goes up only $8 and he assured me we won’t need any extender. We’ll see in a week if he’s right, so I will put this request on hold for now. But I do appreciate your interest.😀