Independent Sales Rep

So I am an independent sales rep. Which means I work with around 12 different companies in the outdoor market. I am looking for a CRM that can work with multiple brands or allow for tagging of accounts different labels for the brands that I sell them. We have 400+ accounts within the brand space that we cover.

Does anyone have any suggestions here. Most I have looked at don’t allow or are not set up for multiple brands or being able to tag accounts with info and have the tags be sortable. Thanks for any help here.