I have Fast Track wheels, 2 regular sized, one stand and one cage mount. I also have a travel size.
The Fast Track wheel can be removed from the stand so it's easy to install the mount, then place the wheel on. This also helps if you want to change location or even for cleaning. I like having both options available, although there are some times when I only have the cage mount in, and other times I'll use either the other regular size or travel size on the floor stand, which allows me to use on floor or on a shelf and is always secured to the cage with a large, oval baby link.
Here is an example of using both wheels, this is the travel size on the shelf. Sometimes I may even use the other regular size on the shelf, but attached at the side, not the back of cage. I change the floor stand options more frequently than the cage mount because it's easier. Currently, I only have the cage mount in the cage.