Master Guan put it in the middle of the altar, if it was just one statue. You stand in front of the altar and look at Master Guan's face. Are you looking at you? God should stay behind 1-2 cm, which means there is a way out.
Incense burner pays attention to ancestor furnace and immortal Buddha furnace. Ancestor foci generally have ears, indicating that future generations can obey. Some Buddha's stoves are also designed with ears, but they are different from those of their ancestors, so remember to tell the Buddha shop that they are incense burners for bodhisattvas when you buy them.
Generally, treasures should be put in incense burners, and coins, rice or seven treasures are generally acceptable. Look at local customs.