Are you wanting to fish Minnesota or Wisconsin waters?
I’d stay at the Country inn and suites in Hermantown… Not as much rift raft in that area and I’d be way less worried parking a boat there overnight. Big well lit parking lot. It’s 10-15 min further drive to the lake than staying somewhere downtown but worth it in my opinion and some better early morning food options (i.e. kwik trip) on the way to the lake.
I live about 20 min straight north of downtown out in the sticks. You’re more than welcome to park the boat at my place overnight if you are really worried about parking lot theft. PM me if you’re in need
That country inn and suites is the one our stuff got stolen from. I thought it would be safer there than most like you said but I guess not. Also they have no cameras outside. Nice place and a water slide for the kids though.