IKEA TRÅDFRI switch adapter for 60mm round junction box

I have completely replaced all the light switches (and the doorbell as well, with a shortcut button) with these at home by simply connecting the wires in the junction boxes using WAGO terminals and mounting the IKEA switches into the junction boxes. It's friction fit, so you might need to do a bit of shimming or sanding in case your junction box is warped in some direction.

ps.: I have used two screws to secure the metal plate provided by IKEA, but you could use the adhesive that comes in the packaging as well.