Legrand Wiremold CordMate Cord Cover Flat Elbow, Cord Hider for Home or Office, Holds 1 Cable, Ivory C6 - The Home Depot

85in Corner Cable Concealer, Corner Cord Hider for One Cord, Wire Covers for Cords, Paintable Corner Cord Cover, Cable Management Channel Cable

D-Line Cable Raceway – decorative cord cover to hide wires on walls.

125.6in Corner Cable Concealer, Delamu Wire Covers for Cords, Corner Cord Hider Wire Concealer, Paintable Corner Cord Cover, Quarter Round Cable

D-Line Cable Raceway – decorative cord cover to hide wires on walls.

cable management - Use baseboard to conceal wires? - Home Improvement Stack Exchange

85in Corner Cable Concealer, One-Cord Corner Duct, Paintable Corner Cord Cover, Cable Management Channel for Wall Corner, Floor Baseboard, Ceiling - 5

Simple DIY Baseboards (and How to Paint Them) - Thistlewood Farm

Legrand - Wiremold Cord Cover, White Cord Hider for Wall Mount TV, Sortable 12 Foot (144 Inches)