You are not paranoid if you are really being spied on. Now the technologies are so advanced that it is not very difficult to organize more or less effective wiretapping of the premises. And if earlier it was necessary to sit for hours and clear records of extraneous noise, now neural networks cope with such tasks.
If you have concerns that your office space may contain such surprises, it is better not to guess, not to climb the suspended ceilings on your own, but to turn to professionals. Because we have the necessary equipment of a professional level, and, as you know, in order to catch a criminal, you need to think like a criminal. We know how such special tools are used, how they are installed, their performance characteristics and parameters. And so we know where to look. And how, if possible, find the one who put it.