If you're running cables some distance, you might look at using something like this..
You can attach the ducting to the skirting boards with double sided tape, which puts the cabling completely out of sight..
My apologies that I did not give enough information in the first place. I own this property.
I really want to thank @MitchellMc @MikeTNZ @redracer01 @consoletable @wooshka for your knowledge and experience. DETA can solve my problem and I have used this thing in my office. It is just for one or two speakers which are branching from living room from the AV receiver. I, also, completely understand that running exposed wires are not safe and do not follow the electrical standard. However, this is DC voltage from AV receiver ( max. 12V/15V) so I might get away with this because I do not have any kids also.
In conclusion: I am getting wireless speakers and do not really want to stress hazards, safety, drilling holes, and color coming off, etc. I really appreciate the advice 🙏.
It's great to hear you've received some helpful advice from members. One fantastic aspect of our community is the wealth of knowledge, including many differing opinions and solutions which are shared openly. I like that you have decided to go with wireless speakers as it resolves all the issues with running the cables.