Zevachim 119 - The Resting Place and the Inheritance
According to Rabbi Yishmael, both "resting place" and "inheritance" refer to Shiloh, and no verse is needed to teach that private altars were permitted in between, because we find many righteous individual using them. According to Rabbi Shimon, both refer to Jerusalem, and private altars were always permitted before then.
Private altar does not require leaning on the sacrifice, or the northern side of the altar, or application of blood all around the altar, or waving the offering, or bringing the flour offering to the southern corner of the altar. Rabbi Yehudah says that there are no flour offerings on a private altar.
Art: John William Waterhouse - A Roman Offering
