What actually goes wrong at more than one location
The failures are predictable, which is the good news. They are also invisible until a customer finds them.
Content drift
Every location page starts identical. Then one manager adds a paragraph, another updates the hours and nobody else does, a third posts a photo of the old signage. Eighteen months later you have six businesses wearing the same logo. Nothing dramatic happened. Nobody was negligent. It drifted, because drift is the default state of anything with several editors and no rules.
The details that must agree, and do not
Name, address and phone for each location need one canonical version, and everywhere they appear needs to match: your site, that location's Google Business Profile, the directories that picked you up years ago. At one location this is trivial. At six it is eighteen facts drifting independently with nobody watching all of them.
When your own sources disagree, you are asking a search engine to judge which is true. It will judge, and it may not pick yours. See local SEO for how that plays out in the map results.
The phone number problem
Someone puts the head office number on every location page because it is easier. Now a customer who wanted to ask the Denton store whether an item is on the shelf reaches a desk that cannot see the shelf. Each location needs its own number where one exists, and the profile for that location needs to agree with the page.
Nobody knows who owns the page
Local staff who cannot fix their own hours will stop trying, and the hours will be wrong on the day it matters, which is a holiday. Local staff with total freedom will rewrite the brand. The workable answer is a split: locations own the facts that are genuinely local, the centre owns structure, brand and anything with legal weight.
The doorway page trap, from the inside
Real locations deserve real pages. The trap is generating six pages that differ only by the place name and hoping search engines read that as local relevance. They have targeted that pattern for years. The honest test: cover the place name and see if anything on the page tells you which location you are looking at.