I have I believe 7 or 8 Nest Cams at my Dad's house. They were installed when my Mom lived there and had dementia. (She has since passed on after moving into a nursing home.)
My parents trusted my brother and I to monitor the cams only briefly to check on them. We placed them everywhere but bathrooms.
They have been a godsend. My father is perfectly content with them, and my brother and I can check on him periodically to ensure he is okay. It also serves as a protective measure, since caregivers know the cams are there, as do potential burglars, etc. (There's a Nest Cam yard sign and some stickers.)
I got the idea to use the cams from some sage folks on his forum. I have no regrets. We are all glad they are there. AND the cams clearly and without question enabled us to keep my mom at home much longer than would have otherwise been possible. She passed on in a nursing home as stated above, but had probably an extra year, maybe 16 months, at home, because the cams enabled her sons to ensure she and my dad were safe. And as a side benefit, the ~$1200 investment in the cams has saved my parents a lot of money in caregiving and nursing home fees, since my mom's departure to the home was delayed, and since we are more comfortable leaving my dad on his own longer, given the existence of the cams to check on him.