I don't think 64 cameras is really excessive, only slightly. The room could probably be covered in about 30-40 cameras (I counted 24 in Liliths's screengrab). Since they're supposed to be super small to be well hidden, yeah they probably wouldn't be that good.
Also, there's the possibility a camera could be discovered by accident. A normal person would start searching and maybe find several cameras (maybe a dozen) and think "damn, 12 cameras? That's a lot" or until they felt satisfied and stop right there, leaving still a bunch more. You guys said it yourself, 64 cameras seems excessive. You'd probably stop after just several.
And I have to say, this was the funniest ep in the series so far...not a difficult task
