What will happen when you will wash the floor ?
What about basement flood ?
I would rather have theme on the wall.
I would use 10 or 12 guage .
Listen to your electrician OR go wireless:
Thank you all for your responses. Sorry for my slow response.
In the end I went with conduit under the concrete floor, surface out of the carpet via one of these: "BG Screwless Brushed Steel Single 1 Gang Brush Cable Entry Wall Plate."
This will sit directly under some atacama stands so cannot be seen. The speaker cable is fed up inside the speaker stands.
For cabling, I used SCP 16/4 speaker cable OFC DCA rated orange jacket.