Premium Search - Privacy

I’ve been considering purchasing the premium search.

I’ve been hesitant because I moved to Brave browser and search to get away from Bing and Google with all of their tracking.

So, currently, I am anonymous with no account associated with my searches and using a VPN.

How will you ensure I get the benefits of premium search on search results without associating any of it with my account/credit card that I would have used to purchase premium.

And finally if I purchase premium search is that per device or on all my devices?