It is only one suit brought in Federal Court in Florida with 19 or 20 states participating as plaintiffs.
I assume (hope) they have done their homework and feel they will get a friendly court hearing in this District Court.
I would have preferred if 5 or 6 separate suits started in different District Courts throughout the country. It would only take one of these to get through the District and Court of Appeals to get to the USSC. Timing is important, and if Fla slows things down, no plan B (that I know of).
In addition to some private suits, that may or may not merit "standing", the Commonwealth of Virginia has filed a separate suit. There was also talk they might in addition join the suit filed in Florida, but I haven't heard any more about that.