I don’t think automatically mounting only one available option should be applied. It is strange and unusual, and for example:
A player (like me) who has the habit of never use satellites in missions so they don’t buy any satellites. But then a new satellite available and that player buys it just to see how it works, but never plans to use it officially.
I know that player could simply manually remove the one satellite from their plane, but sometimes they may go to the fleet just to see all plane equipment they have (for example to see which rare equipments are missing), so I think this player suggested feature isn’t really helpful, not worth changing the original mechanic just for one exception.
Therefore, my answer is no (also because of the additional reason iA stated).