In addition to 'regular' prepper stashes, near the white dots you can find (at least) one hidden magazine, which gives you an additional perk point.
To find all other locations you should visit the official map by UBISOFT https://far-cry.ubisoft.com/game/en-us/game-info/world-map/
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Don' worry about your perks.
Just do all the kill jobs, skinning, fishing and find all regular prepper-stashes.
With the addiotional perk points, which you can find near the white dots at this map, you should get all perks you really need.