Okay, try this: take one. Read all the instructions. See if it says you can't do more than one. If not, try to claim another one. If it lets you, you're probably okay. If you're not supposed to, either you won't be able to see them, or hopefully you will get an error message and it won't let you claim it.
I'm thinking since you probably have to sign up with your real name, probably they don't want anyone doing two, unless they are for different carriers. Since I haven't done any, I don't know if they're all for the same carrier, or if they are competitor shops for several different carriers.
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I pray it does not occur that the last thing I did before I died was vacuum the house or eat broccoli.