Running an extension cord under carpet
I'm in the midst of putting together a home office, which will have a free-standing desk a few feet away from the wall. I'm thinking about running an extension cord for power under the carpet (and having the end come up under the desk), along with cable for phone and ethernet. I'm on a slab so I don't have a subfloor to go under. The extension cord is for a computer, monitor, printer, and phone.
Is this a really bad idea, or not a big deal? Is there some sort of low-profile pipe/conduit I should use? I'm not concerned about code compliance as such, just safety and a clean look.