Home alarm/camera system recommendations

I know there's pretty frequent threads about this stuff on here so my apologies.

My mom lives alone and I am trying to get her setup with a decent and reasonably priced alarm setup (not ADT or anything, but more in the Nest, Ring, Blink vein).

She has a smaller house and the side door is actually more prominent than the front door so I'm not as concerned about the front doorbell.

Costco has the Ring security set that looks decent. Anyone have experience with it? Would it tie in with multiple cameras? I see it is compatible with the Ring doorbell.

Ideally I'd like to get her a camera over each of the three main entry points. And wireless if possible.. or at least nothing that has to be wired into the existing electrical system.

LINK

Would the security set at the link be a good place to start? And can you purchase additional cameras that tie into it?

TIA

ETA: I see now that additional cameras can tie in. I'm tempted to tell her to just bite the bullet and buy 3 of these and call it a day.

LINK