How can I add a random float for a Material Instance Constant?

I found the documentation and I don’t think you understand what I’m trying to do. I have 50+ spawned actors all using a single material (constant). However, I want each actor to be responsible for updating the material with a different random value at the start of the game.

I know you can do this if you created 50 dynamic material instances but I feel like that is a waste… The Material Parameter Collection is used to pass in global values that all materials may want to use such as Player Location, etc.