Do I understand correctly that I can't targed ads to people who belong to specific multiple subreddits.

I am trying to sell digital 3d printable toys from a specific franchise.

So I chose ("Franchise Subreddit", 3D printing, and toys subreddit). But from what I understand, there is no way to advertise it only to people who belong to all 3 subreddits at the same time? Instead, it will be shown to people who subscribed to either of these subreddits?

If that's the case, it makes no point in advertising on Reddit; is there other sites, where I can actually properly target my ads