Which buildings benefit from engineers?

I keep building buildings that can't use engineers next to workshops, leaving some of the workshop's drones unused. This is clearly not optimal.

So which buildings benefit from engineers (and should thus be built next to workshops)?

xcom-2

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Does Shadow Chamber need engineer?

Gremlins are functionally identical to engineers, so you want them next to things that need engineer staffing. Every building except the Guerilla Tactics School, the Laboratory, and the Shadow Chamber can staff an engineer.

Does proving ground need engineer?

The rooms I know that use engineers are: Advanced Warfare Center, Proving Grounds, Resistance Comms, Power Core, Defense Matrix and Psi Lab. I'm probably forgetting something, but those are all the ones I remember right now. Guerilla tactics doesn't need an engineer.

Why do I need an engineer?

Being an engineer is important because you can make peoples' lives better. You can invent technologies that make travel safer and more green. You can create better medical treatments that save lives and make people more comfortable.

Do I need 2 power relays XCOM 2?

So to wrap up you need two power relays one of which should be on an exposed power coil and the other can be where it fits best with your other facilities.

Why So Many CEOs Are Engineers

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Afreed Mohammed, Peter Olexa, Laura Tancredi, Nextvoyage