I would rather go with one main business account and and website, make the account look good and create more boards, maybe 5 to 10. One board will be for your own pins, rest will be random but still connected to your niche.
Pin pins from your website to your main board regularly and use repin tool to populate rest of your boards.
Create more accounts, each with 5-10 boards, personal accounts, real looking. Repin pins from your main account (main board) to relevant boards on those accounts. Joing Pinterest group boards and repin your pins there too.
These accounts should also pin other pins, not just those from your website, so they are kept alive. Turn on repin tool on each of the boards.