I bought these from Amazon, because the molding I have is rectangular and these just happen to be the exact height to match the molding... now the molding just sticks out about a half-inch more from the wall and is not noticeable unless you get down and scrutinize it.

https://www.amazon.com/Cable-Concealer-Wall-Raceway-Management/dp/B082X9RCZX/ref=sr_1_4?crid=3GNJP7C8YTD1K&keywords=cable+raceway&qid=1685764405&sprefix=cable+raceway%2Caps%2C105&sr=8-4