Those are the very few that are indoors, before I use Coopex, they may come back but won't cross the Coopex line.
I spray every 6 months and that, with bug bombs and roach baits seems to do the bug trick for 6 months.
We get them coming in now and again, they are easy to spot as they are usually the size of a small dinner plate!
I generally cover them with a container and slide a bit of card under, then take them outside, done.