Buildings on land don't move. You don't have to plan for the scenario where your neighbor's house shifts it's location a few degrees and runs into your house, or where your neighbor's house will be in 2 years.
These constellations aren't stationary, they move based on their orbital parameters, and to properly predict their orbits, you'll have to account for their future movement for the next while (depending on expected lifetime and how close they come to your intended orbit).
Saying this is like buying a plot of land is missing the level of work and complexity that goes into orbital mechanics.
If you need to illuminate the same area of the earth, which would make sense if you're also looking to serve the same populations, then you'll need to either be at a different altitude or have neighboring or intersecting orbits, which will need to handle the orbits of all other objects. That's why the level of complexity increases a fair bit when you need to plan for two large-scale configurations.