They should be alphabetical. If you want to "group" by room, I would use some sort of naming convention, like putting the room name first whenever you name the rule.
Here is an example of the sorting I mean (ignore the fact that I start all my rule names with then name of the app...I like it, but many people don't--point is, they're all alphabetical and I didn't create them in this order):
I guess this part isn't really a question, but I'm still confused. The order you create a rule (or any app) in doesn't matter; if they both respond to the same event, they'll happen more or less at the same time (or at least nearly so and not in a guratanteed order). If you're running one rule from another, e.g., with Run Rule Actions, and are this controlling the order of execution in this ir a similar manner, then...nevermind! Just wanted to make sure there wasn't any confusion here.