Reddit reviews uxcell A15112000ux0021 Corrugated Wire Cable Conduit Tubing Tube Wrap, 21.5 mm OD 5M Length Black

We have two cats that chew on wires (including phone chargers and headphone cables). Using something like this cord wrap stuff, makes it unpleasant to chew.

I think that's big enough for nights and unsupervised time. We have something like this that Novy used as a run when he was little. We got a second one and connected them together and that's what he uses when we're gone during the day now. He still goes up to his cage (2ftx5ft?) at night. When we're there he has roam of a few rooms and occasionally the upstairs.

We use cable wrap like this to cover ground cords. He's chewed on them a few times but there's no damage. As long as they're against the wall they'll be fine. For my computer desk I screwed a postal mail tube underneath it and split if length wise to stick the power strip in so it's up out of the way; as a bonus it looks better too!

For the bookshelf, we use gating that looks like the stuff from the pen I linked to above for temporary 'keep bun out' areas like that (in my case the entertainment center).

[Edit: Updated the cable wrap link, used the wrong one initially!]