That product may only be labeled for lawns, and that's where the grubs would mostly be anyway, but they could also be flying in from a neighbour's lawn. The active ingredient according to Google is chlorantraniliprole, the EPA factsheet for that is :
https://www3.epa.gov/pesticide...
One or two adults in the beds or grubs? A few of the grubs aren't likely to do much damage.
From:
https://ag.umass.edu/turf/fact...
" Chlorantraniliprole (Acelepryn™ for commercial applicators, GrubEx™ for homeowners) is a relatively new insecticide from DuPont that has very low toxicity to vertebrates and no activity against bees, ants, or wasps. The product has a very low level of toxicity, so much so that a signal word is not required on the label, not even "Caution". It is extremely effective against all the species of white grubs we have in New England, as well as most caterpillars (such as cutworms, armyworms, and webworms). However, it takes 60 to 90 days to fully dissipate in the soil so for optimum effectiveness against grubs, it should be applied between mid April and early June. Applications after early June may result in reduced efficacy for grub control, but will still provide excellent protection against caterpillars."
