Using two pairs of Powerline adapters on the same line?

Question

Computer networks

There is: a router with 4 outputs, 1 is configured for iptv. In another room, there are an iptv set-top box and a stationary PC nearby. At the moment, iptv is transmitted through a powerline adapter, the Internet is via wifi.
Task: to transfer both iptv and the Internet via powerline.
I tried: buy the cheapest pair of powerline adapters with two RJ45s in each, connect everything at the same time. Both devices begin to choke - TV freezes, the Internet drops from 60 to 8 Mbps. Passed back. In technical support, they said that it won’t take off like that, and you just need to use two pairs of adapters. Because there is little information, and again I don’t want to buy something in vain, I would like to consult.
Will it really take off if you make 2 pairs of 4 powerline adapters, insert them into each other (adapters with a socket) and connect iptv to one pair and ethernet to another pair?

Answer 1

IPTV through Powerlilne is a complete mess, because it will be hard to pour a TV box, especially if you put a load on the electrical network, then turn off the lights altogether.