Most Helpful Guy
The "2 months" rule was a marketing scheme to rake in more money.
Here is a longer version with more info on more U. S. marriage traditions.
If you still want to do it (or something similar), make sure you both agree on it, that you both see value on it that makes it worth the expense, and that you're both doing it because you really want it, and aren't just being toyed with like fools or forced into it by peer-pressure.1
Most Helpful Girl
Find something that is within your budget and is meaningful for you and the person you want to propose to, that's what I believe. It should not be expensive. And never hint at the person or tell them what to get you. Let them get you something that speaks from their heart.1