The process does not require land, it requires a surface exposed to sunlight, which could be warehouse rooftops, vacant lots in urban areas (not Detroit, it is too cold for this process to work much of the year), or even floating islands in the Gulf of Mexico.
Or maybe the Everglades, if it could be assured that the system would be highly unlikely to rupture and spill hydrocarbons all over the environment.
How about repurposing brownfields or hazardous waste sites?
As with solar energy, the best location is on the Equator at a high elevation with neglible cloud cover. That would be Quito, Ecuador. The economics would be several times better than Arizona.