You can set up a 10gal as long as you understand fish going into that tank, will need to be smallish. I would not setup on the floor. You need to be able to observe the fish for diseases, health, etc. That is part of the process of QT [being able to observe the fish closely]. So, unless you want to be crawling around on the floor frequently, come up with some kind of stand. A cheap medal stand will work fine, an old table too.