Where can I file for divorce?

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The reason you see nothing in the act is that the attorney who posted that answer is just trolling for points. It has virtually nothing to do with your situation. Assuming she can claim residency in Arizona and you in Maryland, the case will almost be handled in the state in which one of you is first to file.

sorry...that should read "almost certainly"

You refer to Arizona as "our home state." How long have you been a resident of Maryland. If the grounds for divorce (e.g., voluntary separation, adultery, etc.) occurred in a state other than Maryland, you can only file for divorce in Maryland if you have lived here for one year.