I knew homeplugs worked best in main’s sockets and not on extension cables but BBC iplayer on my TV worked fine so I got a firestick to stream from my satellite box. Although iplayer on the firestick worked fine the streaming was terrible. Sure enough attaching them to mains's sockets cured the problem. However I do not have enough mains's sockets. Will Wall Adaptor Sockets (like a plug-in double or triple plug) work any better?