I ordered the posting of ads twice, 500 pieces each in a fairly limited area. Very bad. Two ads are put on one board, explaining that this is supposedly more understandable, some houses are simply skipped. Entire streets (pillars) were missed. At the same time, despite the clear instructions, the poster will begin to tell what he knows best, and that people on poles will not read on this street.
Prepare for the fact that 30 percent of your ads will simply be thrown out. My territory was small, it was easy to get around and roughly calculate. To be honest, I think that in my case up to 50% went into the trash, but I won't vouch.