One Site, Multiple GMBs?

Hey,

How would you go about optimising NAP for multiple GMBs associated to one site.

Let’s say you have a site in a local category. The site ranks for multiple keywords of that category in a given city.
The site is optimised for one main address and NAP. Only the main GMB has the same NAP details.
All GMBs are associated to that same category but obviously have different addresses and names as EM keyword (category + suburb) in multiple suburbs on that category.
Would you add each and every GMB address in the site? In a local business schema?
Would you list the site on directories for different NAPs? What about NAP consistency?
The goal being to rank the GMBs for category name + suburb?

Yes....the goal being to rank the GMBs for keywords + location

so yes you register each one.

if I got category computer parts and I got x3 computer part business names and addresses, if I wanted to add them to a directory as I am promoting them I need to add all x3 to the directories under computer whatever ......

if it my website and not promoting the individual business then I don't add them to anything.

I'm new user