I’m with MB on the thick tubing from Home Depot. It’s kind of a pain to cut the slit in it (because it’s thick) but it works. I also bought something similar online that was scented with lime to deter bunnies. That works really well too, though I would say it’s a bit thinner than the hardware store stuff so for a determined chewer it might be better to go with the thick stuff.
You an also get cord hiders that push the cord against the baseboard and then cover it to hide it from view. This could be really good for tvs and other electronics like that, then you can put the tubing around the parts that don’t rest against the wall instead of putting tubing on foot after foot of wire.
We also just keep the majority of our wires behind barriers. I use NIC grids to block off the areas around the tv so Hannah can’t get back there. I also have a lot of computer wires in the corner of the living room (between two couches) so I block that entire corner off so I don’t have to worry about it. Hannah can jump the barriers, but she rarely does it and she’s not free roam so we can catch her quickly and get her out of there before she does any damage.