Looks to be the most practical way to arrange them on the pole.
I'd suspect moisture in the form of dew, condensation, melting snow, rain or whatever to be a bigger challenge than cold. ..and eventually torn up windscreens from bird feet, covered with droppings. If you intend to leave them up long term, you might rig up some kind of small visor type roof directly over them to provide a little bit of shelter. Camera has its own little roof built in already.