Brett, they're subject to using just about anything if it's in the right place. Case in point : seen a TV angler catching bedding Crappie on the lower unit fins of outboard motors on boats parked in slips. I've caught them off the stationary posts of marina boat slips, myself, and seen Bass use the lower unit fins of motors on boats in a covered slip. I've seen Blacknose on the beds on top of a rockpile that was on a point not 20ft from the corner of a often used fish cleaning station (at the end of a covered boat slip dock) and in less than 2fow.
Right place, right depth, right temp, and right time ... they could be almost anywhere. They do have their preferences, but when those are not available they'll use whatever has the most conditions for a successful spawn.