Google "cable hiding kit", or "raceways".
All sorts of sizes and options are available along with elbows and Tee's to fit corners or permit a multi-cable installation to branch. Some trays have tape on the back. Pull off the protective strip and stick the tray into place. Not recommended.
Eventually one of two things happens: 1) the trays unstick and fall off, or 2) removing them pulls paint off of the wall.
I prefer to use small flat head screws to secure the runs. Bit tricky to get the cover unsnapped and opened up to get the screw in. Generally you only need a screw at each end about 1/2" (4 to 5 cm) and especially so if the run is resting on top of the floor molding.
Example product:
https://www.amazon.com/slp/wiremold-raceway/95vgtqjjr9uw62u
Because the longer pieces unsnap to allow you to just lay in the cable, a fish line (to pull cables through) is not needed.
You simply lay the cable in place and snap the cover closed. Cheaper products tend to start splitting or cracking if opened and closed too much.
And you can use cables with plugs already on the ends as you do not need to have tray room to force the plugs through.
You can google for similar products and options. Size as if you are going to install two wires.
The original "Canaleta adhesive TEHALIT blanca" tray is small. 1 cm x 1.2cm x 200 cm.
Could be tough adding a second cable later. Of if covering a thicker power cable.
Hopefully you have some means to go a store or two to actually look at the products. The images always make the trays look longer and roomier.
There are a number on online videos showing to install the trays (raceways). Again I prefer small screws to avoid damage from the adhesive. And/or to allow me to "rearrange" if a do-over becomes necessary. watch a few such videos before you buy.
Wall staples are a good option.
Wall staples come in a variety of sizes and shapes. Flat for telephone, rounded for ethernet.
https://www.homedepot.com/p/Power-G...ERCH=REC-_-pipsem-_-202018409-_-203709059-_-N
Likely cheaper and overall easier especially if the cable run is not too long. And if the cable color is matched to the wall color or floor molding color the cable could simple blend in and be unnoticed. Removal is easy and only little tiny wall holes to patch.
Key is to not crush the cable when you nail down the staples.