Why does it say that Eliezer was standing Al ha'Ayin?
Ohr ha'Chayim, citing Yalkut Shimoni: When he saw Lavan running with evil intent, 1 Eliezer said Hashem's name to elevate the camels in the air above the spring, and he was by them. Lavan said "Ba Baruch Hashem", and Eliezer descended. He then said "why do you stand outside?"
Ohr ha'Chayim: Even though Rivkah said that there is room in her father's house to lodge, he did not go to her house, rather, he stayed at the well.
Ha'Emek Davar: The camels were by the Be'er, and Eliezer was by the spring, overseeing them.