It is something we've thought about a bit (but "bit" is the thing).For wife's "peace of mind" I'd consider one of the doorbell type camera that also allow two way conversations.
I somewhat baffled (& not overly intrigued tbh) by CCTV & Clever Doorbells.
Which ones are good, which cams are compatible with what, do you need ones with Apps (& if so which ones), do you need a subscription, which ones are a ripoff just well advertised, is it better/cheaper to assemble your own etc etc.
Yes you want something to be decent, user-friendly, effective & to work well & reliably - but you don't want to he conned into getting something "meh" at strong money when there's better value.
If anyone has any recommendations then be happy to get them

(Hopefully not too expensive cos we just spent a small fortune on a new hip for the wee woman lol.