Another vote here for the wavy racks for multiples or the post-and-circle singles. The standard size U-lock was invented to encompass two tires and a parking meter post, the idea being you remove the front and put it next to the rear. The wavy racks are the same diameter post so the same idea works.

There are some seemingly-clever racks at my dentist's office that are supposed to hold the down tube with a shackle. But the down tube of almost any modern aluminum or carbon bike is too big to fit it.

There's something like those "Walmart" racks at our local CVS. They're not exactly the same, I don't remember the arm on the ones I'm thinking of. They are all now a very loose fit to the ground. I think someone tried to unscrew them and gave up when the bolt started to turn instead of the nut. In this photo, one of them is gone. The other rack you see is so close to the wall that a wheel doesn't sit down in it, and only half the positions are usable at all. Utter fail! Google street view link

Our Walmart, by comparison, has post-and-circle locks with some cables dangling off them, a nice touch so you wouldn't need a second lock or to remove the wheel, if you are bothering with that. Another Google street view link The same Walmart has bike boxes, but they are not occupied by bikes, ahem.