So Arizona's no different than North Dakota (and perhaps some other states) as far as how the two representatives from each Senate district are elected. Idaho and Washington State (and perhaps some other states) elect each representative in their two-representative districts in separate contests. New Hampshire does the same as North Dakota and Arizona in its multi-member House districts. I'm not sure how Maryland (whose Senate districts can be divided into three single-member house districts, a single-member and a 2-member house district, or serve as a 3-member house district) elects its Representatives in its multi-member districts, in separate contests or in plurality block voting. I'm sure it isn't a proportional method.
Maryland is like the rest mentioned -- if you live in a 2 or 3-member district, they all run on the same ticket and you get 2 or 3 votes, respectively. That's one of the reasons why Maryland has such a heavily-Democratic State House; Montgomery and PG Counties are representated 100% by Democrats.
Going back to the original, mistaken assumption, it doesn't seem to me that the idea you could only have one vote in a two-representative district. That doesn't sound constitutional.
Limited voting (where voters don't have as many votes as there are seats to be filled, but potentially more than the one they have in SNTV) is used for most municipal offices in Connecticut, some county commissions in Pennsylvania, and in more than 20 municipalities in Alabama in North Carolina as an alternative to drawing majority-minority districts, according to
Wikipedia.
One could argue it's unfair (although the courts have ruled it is constitutional, even in conjunction with single-member districts, to a point at least) to allow people to cast more than one vote in a contest but forbid them from casting more than one vote for the same candidate, as is done for State Representative in all of these states (except for Idaho and Washington State where the two State House positions in each district are filled in separate contests).
