That's good advice - thanks very much

@Alexandre. Many thanks for your reply Alexandre! To be frank, I don't understand why they dont sell the X55 in twin packs or solos. Very annoying. I am not an expert!! I looked at the pack for X55s...

Hello. I'm afraid I only know my system by the names on the box: TP-Link Deco X55 AX3000. I bought a pack of three from Amazon. But it's not enough, I need one or two more, but I cannot buy single...