They all should be able to be used at home, most are just very expensive. The A1C Now is listed in those studies, and that is the exact same machine as the CVS/ReliOn, with different logos.
Looking at it again, if cost is a factor, maybe getting a lot of strips for the A1C Now and just doing a few tests over a couple days may get high accuracy for the cost. 20 strips + machine is about $180 USD, or $6-7/test. Getting the 2 strip machine is less cost efficient. I think the machines are calibrated to the strips, so can’t order separately.
The meta-analysis above says most machines have a negative bias, so you could just pick the highest result of a few tests and would probably be closest to true.
This way would also yield your inter-assay coefficient of variation (%CV), which is an interesting thing to know. The international standard was made to be about 2% a decade or so ago. Typically it is 10%, but the A1C is stricter than others because very important not to misdiagnose patients.