Wouldn't people evaluating your product usually be the people to decide whether to use it? How often do people just hand out their manager's numbers to random sales people?
A good sales person will find your manager. “Hi, I see containedgravel and two others from your team are already testing [product] for [use case] in order to [benefit]. If you have 30 mins this week I can show you how to add governance, how to model and reduce your costs, and introduce you to our solutions engineers to help with a smooth rollout.”
And the first thing the manager will do is turn to their engineers and ask, “So, what do you think of [product]?” And that will determine whether the manager takes the call or not. Which is why winning over the engineer is critical.