If the garage where you keep it gets too cold, then it can slow or stop fermentation. I am in San Diego and didn't think this would be a problem, but recently, the interior of the chamber dipped to 58, so the chamber got moved inside where ambient temp is above the temp I want to ferment at. Something to consider in planning location.
Also, check your depth of the chamber and be ready to build a collar on the front to allow for the entire carboy, but don't let that stop you. Go for it.