Do off-screen cameras take up resources?

Hi

I’m setting up a scene with a number of objects.
The player can walk to each object, click on it and then a close-up of the object (fx. a table) comes up where he can further interact with the object.

I’m setting these close-ups up with their own cameras, so I can just switch to each of these cameras from my main camera, when I want to activate a close-up.

My question is, is this the best way to handle this mechanic?
Or do all of these cameras (20 as we speak) take up a lot of resources - even though they are off screen?

You can just disable the cameras that you are not using