Do I need a menorah to light Chanukah candles? Or can I just plop my candles or oil cups down on the table, and light them there?
The Avnei Nezer 2:500 quotes several opinions that state that one needs to have the candles lit in some sort of kli (vessel) and not just stuck onto a table. (h/t: DoubleAA) R. Shmuel Kamenetsky (Kovetz Hil. Chanukah pg. 29) also writes that one should be careful to use a kli, even if one is using wax candles that can stand by themselves.
However, R. Hershel Schachter (Nefesh Harav pg. 226) quotes that R. J.B. Soloveitchik would make fun of those who were machmir regarding this issue, saying that there's no reason to require a kli.
Apparently, you do need a menorah, according to some opinions brought by the Avnei Nezer (2:500), cited in this answer by Double AA.
( I found this answer while doing research for this question :P )