>perhaps a large property where there are multiple entrances and exits, and lots of potential targets. e.g. a farm, where there are long easily traversed boundaries between the property and neighbouring properties.
Not so large, given that (per specs) [1] each sunflower has ~8 m, range and the bee has 300 m transmission range.
Btw you need to bring a power cable to each sunflower, seemingly in "clusters" of 7.