You can add ropes to a model with Propper, but they don't work on static props, I think. Afaik it's exactly the same thing as if you'd used move_rope.
If you want some static cables modeled, I could probably do that for you.
If you are using version 0.3, you need to specify a brush entity to use for collision (even if it's the same propper_model you've just made). Otherwise it will make it non-solid.
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