Also, 5G is simply a name for a standard for wireless communication. All the comms still connect back to a central switch. They'll put them on the first floor or wherever it can be secured. Some old buildings you have the equipment near exterior walls. The buildings typically are built to whatever local conditions are expected. Such as Midwest telecom centers usually have tornado and blizzard mitigation while Southern ones have hurricanes in mind.

I don't think any are designed with car bombs in mind.