✅ Should NuGet package be installed both in the main project and class library?

Hello,
A NuGet package exposes some interfaces which I would like to implement, but the library also needs configuration, which must happen in

Program.cs

Program.cs

.
Should I only install the NuGet package in the class library and reference it in the main project, or install it in each project?

✅ Should NuGet package be installed both in the main project and class library? - C#