If you need to partially hide your cameras, wireless security cameras are the answer. Places such as banks use a combination of wireless and wired cameras, visible and hidden to intimidate potential thieves, but continue to photograph them even if they disable the cable cameras.
Las Vegas casinos do the same. Look around the next time you enter a casino or bank. There are obvious cameras and they are for "advertising" purposes. In other words, they are there to intimidate a burglar or a potential thief, knowing that their actions are recorded. The owners of these establishments want you to watch these cameras and that they think twice before doing anything naughty in their workplaces.
Then there are the hidden cameras. Almost always wireless, so they can be placed anywhere, they shoot through small holes in walls or ceilings, or behind specially designed ordinary devices, which you expect to find there. Wireless security cameras are those that inform police about people who may have committed a crime after disabling visible systems.
Wireless cameras can run on batteries. In other words, they are used to monitor people's activities for a limited time. Their advantage is that they can be placed in a variety of easily hidden positions, much more than a camera that requires one wire to be connected to both its power source and its recording device.
Recently, these cameras have been integrated into clocks, children's toys and other common home appliances and have been dubbed "nanny cameras". They have become more popular for catching babysitters and nannies who look after precious children who may not be speaking yet. Horrible abuses sometimes occur when unbalanced adults are left behind by infants who can not speak.
The parents concerned started using these devices to record the actions of the adult in charge during their absence. Then the couple could read the tapes and see what was going on in their absence. Some of these tapes were so horribly horrible in what they captured on videotape that they led to the prosecution of the adult offender and often resulted in television shows on the national tabloid. Since then, they have become an integrated and cleverly hidden device that is often found in homes where young children are supervised by a recruiter.