I can suggest the following scientific research model:
1. There are science centers in the game.
2. You do NOT hire scientists to work in research centers, but heads of research laboratories.
3. Each head of scientific laboratories has his own laboratory with a certain number of scientists and equipped with equipment of a certain level and quality. All laboratories differ in cost, number of personnel and quality of equipment.
4. You entrust the research of scientific projects to these scientific laboratories. You can assign as many scientific laboratories to each project as you want.
5. These scientific laboratories are scattered all over the globe. The number of laboratories with which you can sign a contract depends on the number of places in your research center.
6. If the region is lost or aliens attack the city, these labs may be lost. (If they are located there).
7. Unlike individual scientists, each scientific laboratory can have many properties: the number of staff, the cost of work, the speed of work (quality of equipment) additional bonuses when investigating a particular type of artifacts (transport, aliens, tools, technologies)