What product are you using?
For the desktop product, I would suggest storing posts in a common folder with any other template type data. If you are working on a network with others then this should be a network location so that all in your company have access to the same library of post processors.
With Fusion 360, you are best to enable cloud libraries and store posts in the "Asset Library" In this same way post processors, tool libraries and templates will be synced across devices & users at a company.
In all cases, you want to avoid putting posts in the install folder as these can be overwritten when we update the software.
This also means you can reduce your list of post processors to just what you use in your shop.
Screenshots below.
Setting location for Post Processors on desktop products:
use personal posts folder or you own folder location.

Setting location for Post Processors on Fusion 360



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AL Whatmough
Director Product Management - Manufacturing
Note, I love to engage on the forums. However, I spend a lot of time in meetings trying to help clear the path for our amazing team of Developers working on Manufacturing at Autodesk. So, if I don't respond immediately, it's not that I don't care.