Are those pipes in a crawl space? My spigots come out of the basement and I’ve never done anything to protect them. They’ve survived many below zero nights with the lowest at -22. Over 30 years in this house.
It’s a real mystery in my neighborhood how some will have extensive freeze damage and others none, with similar construction. One old house with lousy floor insulation doesn’t get freeze damage I guess because the heat manages to leak down to the pipes enough to keep them thawed. Leaving a faucet dribble definitely helps except maybe areas at the dead end of a pipe (like an outdoor spigot).