I found a sitter with multiple feedbacks but mostly in a ine or 2 day period...how can I be sure they are real.?
The feedback you might have seen sounds like testimonials, which new sitters solicit from friends, family and non-Rover clients. The fact that they were dated within a couple of days of each other isn't reflective of anything suspicious. Rover might upload them all at once, when they activate a sitter's profile.
Rover's Terms of Service place the responsibility on you for determining whether a sitter is right for you. That will mean interviewing them and doing whatever else you need. Rover does require basic background checks be done on all, but they do not verify testimonials. You will also note that some feedback will be labeled "Verified Stay." Those are from actual jobs booked through Rover. You should have more confidence in those,