Leaving One's Home Unfinished Zecher LeChurban: Does it Have to Be Adjacent to the Doorway?

The obligation of leavings one home unfinished, Zecher Lechurban. Does it have to be adjacent to the Doorway? Gemara Bava Batra 60b details the rabbinic institutions that Chazal made as a commemoration of the Churban. Rambam (Taanit 5:12) Shulchan Aruch (560:1)