Few days back i bought the Tp link Ac1200 archer A6 with mesh technology (v2) and connected it to a fiber connection successfully. 

Few days later, I bought the Tp link Ac1750 archer A7 with the mesh technlogy as well. 

I tried two methods to connect between them to make a one mesh home wifi network. 

Method one was by connecting both of them to the same main fiber modem. Method two was by trying to connect using wifi ( by making one device connected to the main fiber modem through cable and trying to connect the other router wirelessly).

Unfortuanately both ways failed as I couldn't see the other device when tryig to connect between them.

Two days back I read that a mesh network could be established (created) between a router and a wifi extender only and couldn't be established between two routers :(

Can somebody confirm the last sentence please ? 

and if it is true then what is the solution that I can implement to establish a mesh wifi at home using my two routers that I just bought.

Thanks.