Yes they work very well with little loss of speed or signal. Even all the way across to a shed at the far end of the house.
They’re easy to connect to but the one I used (a more basic model to the one you’ve listed) needed to be plugged directly into a wall socket as did the receiver.
Luckily there were plenty of wall sockets available.
I don’t know if it created a separate network but there was a slight break in connection (a few seconds) when you re-entered the house and it reconnected to the home router.
They’re easy to connect to but the one I used (a more basic model to the one you’ve listed) needed to be plugged directly into a wall socket as did the receiver.
Luckily there were plenty of wall sockets available.
I don’t know if it created a separate network but there was a slight break in connection (a few seconds) when you re-entered the house and it reconnected to the home router.