Could the aperture labs be mobile like the borealis?

We'll I've been thinking, Glados says she is the one keeping aperture safe , and i thought how can she ? The labs location were well known by: workers , astronauts and even vagabonds , so how come the combine didn't went there asap with their interest in the borealis, which got me thinking.... The exterior of the exits in portal 1 and 2 are completely different One is a field while the other is a parking lot, The teleportation of the borealis happened a long time before portal 1 making glados and the scientists enough time to perfect the technology, that is teleporting and properly displacing matter to fit the teleported thing ,so I wonder maybe the way the combine didn't find aperture is literally because its not there anymore