There are many different sets of rules for ring games that are commonly used. It's obviously important to clarify them before the game starts.
If the 10 ball is the only money ball, then I would default to the 10 counting in any pocket or not at all. To specify the bottom two pockets not counting is too specific of a rule to be assumed without prior discussion.
If you are playing with two money balls (i.e. 5 ball & 10 ball), and the 10 ball is made early (on the break or early combo), the 10 ball will spot up as long as the 5 is still on the table. So if you make the 10 on the break and the 5 stays up, you will get paid for the early 10, spot up the 10, and keep shooting. This gives you a third opportunity to get paid in a single rack. If the 10 is made early again in the same rack, you get paid again and it spots up again as long as the 5 is still on the table. Technically, it's possible to get paid countless times for the 10 ball in a single rack.
There are also a lot of strange rules that come into play when you scratch. What happens if you make a ball and scratch? Place cue ball in kitchen? What happens if the lowest numbered object ball is in the kitchen? Does the ball before the money ball spot after a scratch? Can you get a free shot at a money ball after a scratch? What happens if you make a money ball and scratch? All important things to consider before the game.