Range extenders are terrible. Never use an extender using your electric circuits. There are many options on putting in a network in your home. Wired network with switches is the best. If you don’t have or can’t put in a wired network, then a mesh network is your best option. The next option is using multiple routers throughout your home.
There are multiple ways to install a mesh network or a network with multiple routers. I setup my mesh network in a wired bridge configuration using the latest tri-band wifi6e nodes. I tripled my wifi network speeds throughout the home. My music server uses wifi and my dac is connected straight to the router. Since implementing my mesh network, my connections to the server are more reliable and the speed increase is huge.