I have tape on my iPad front cameras but not on the phone. None of the back cameras are covered since I use them often. So far I haven’t found a good way to cover the cameras without making them hard to reach when needed.
I used a dot that is used for cupboard doors to close close against so they don’t bang shut. I peeled off the sticker and stuck it on the camera on my computer. I have not covered the camera on my phone.