The critical date is the meeting of the electors: December 17, 2024. From that, an adjustment must be made to allow for establishing residency in another state, but that may vary depending on the state. Cheney's return to Wyoming (raised in Wyoming and represented Wyoming in the House) was done in July 2000. Note that the Republican National Convention to nominate Trump will meet in July 2024.
Should Rubio have been selected and to be announced at the convention, Rubio's move to another state would likely be planned to occur in July. However, unlike Cheney, Rubio has never been connected to any other state. In any case, Rubio will need to resign from the Senate.
There is a law review article from 2001, Who's Afraid of the Twelfth Amendment?, that examines the meaning of "inhabitant" within the context of the Twelfth Amendment. One of the issues raised was whether Cheney was an inhabitant of Texas at the time of the Election.
... a group of Texas voters filed suit in November [2000] challenging the legitimacy of a vote by Texas’s electors for both Bush and Cheney.
Jones v. Bush, 122 F. Supp. 2d 713 (N.D. Tex. 2000). The Fifth Circuit summarily affirmed. Jones v. Bush, 244 F.3d 134 (5th Cir. 2000). The opinion, in its entirety, reads, “All requested relief is DENIED.” Jones v. Bush, No. 00-11346 (5th Cir. Dec. 7, 2000).
The court examined dictionaries from around the time of the ratification of the amendment to discern the meaning of "inhabitant" and, by one definition, one could be an inhabitant of wherever one owns property. Another used permanent resident.
The court's opinion is unpublished and "is not precedent except under the limited circumstances set forth in ...", which means the question could be revisited.
The circumstances concerning Rubio are different than for Cheney. Cheney had homes in three states at the time. As far as I know, Rubio has only one home in one state.
2024 Electoral College
December 17, 2024—electors vote
(the first Tuesday after second Wednesday in December)
The electors in each State meet to select the President and Vice President of the United States.
Twelfth Amendment Election of President
The Electors shall meet in their respective states and vote by ballot for President and Vice-President, one of whom, at least, shall not be an inhabitant of the same state with themselves; ...