Hello.

I got Archer VR600 V3. 

I want to add 2 mesh devices to my home. The Router in in the living room and the wifi connection is not good on the kids rooms which are at the far end of the apartment.

Square size is meaningless since the rooms are small.

I got a 1gb Ethernet connection to the rooms (and the computers and consoles are connected to it via gigabyte switch but the tv and cell phones are not connecting properly.

There are maybe in full capacity 4-5-6 devices simultanisuly online in a room. 
What tp-link product will best suite my needs?

In one of the rooms i got a Archer VR600 V2 router as access point but i want to convert it to mesh.

Thanks,

Mike