Please don't mistake the following as any form of legal advice--it's not.
The challenge for some, who aren't experts in the foreclosure process, is finding the right info in sufficient time. The staff for many county clerk of courts offices nationwide won't answer any questions beyond basic auction date info, or where certain records are physically located, and they'd redirect all other requests to an attorney. Plus, most of them won't share that kind of info with someone who isn't a party to the foreclosure action, and a renter isn't a party to the foreclosure action.
Additionally, the right of redemption is often (and is in MN) transferable. So even if the current owner of record opted to convey that right to someone else, then a renter might have to move sooner than the expiration of the redemption period.