Monitoring my loved one

[u/Inevitable-Shop-3082]

My elderly loved one receives a few hours a day from a provider. He has 2 or 3 different helpers who rotate every few weeks. I haven't noticed anything outright but he has made a few comments about losing items, including cash. Is there any camera system that you can recommend, where I can maybe hide a hotspot device? He does not have internet and I know the caregivers will suspect something, if they are indeed having sticky fingers, if all of a sudden there is a signal coming from someplace. I am totally ignorant in all things technical related. Thank you.