In any hive, vertical or horizontal, bees will not move across empty comb or empty spaces while clustered from the cold. So putting the empty combs at the far end from the bees is the right place for them and putting full combs up by the cluster is the right place for them. Usually, the bees will already have planned it that way, but you can intervene if they haven't. I try to have the cluster at one end, full combs next and empty at the far end.