Parameters of type "Family type"

New to Dynamo, and can’t find answer about possibility of creating “global” parameter of type “family type”? Or maybe there is another option in Dynamo for my task.

I’m working with script that places the same FamilyInstance near the doors of predefined rooms.
I want to define a parameter for example x=FamilyType.ByName(“Object1”) and then use this parameter for all the other nodes.
In that way I won’t need to connect node with FamilyTypes to each node where I use it, and make script messy (it will be more than shown in a screenshot).

How can this be done?