I've actually had one AC110 overflow to the rear of the filter & onto the floor one time. The filter was installed level, using the leveling leg that comes with the filter.
I was using a new AC110 foam insert with one layer of Big Al's Filter Floss, which is more like a pad than loose floss. I had cut the pad long enough to overlap the short ends of the foam insert. But I also cut it too wide & it overlapped the long sides of the insert also. So in effect, the media & basket were wedged in the filter & couldn't 'pop up' when it got dirty.
The water could not overflow toward the intake area of the housing but instead overflowed toward the right rear corner of the housing & bubbled up and out, past the lid & onto the floor. I could hear water dripping but it took me a few minutes to locate the problem.
I clean the AC110 filters weekly without fail. I have 2 AC110's on this tank, as well as an Eheim 2217 & a 2262. It is a 220G heavily stocked Mbuna tank that generates a lot of waste. In my case, I think the problem was caused by having the floss wrapped too well around the foam insert & when it became clogged, the water found a path out where the floss gapped slightly at the rear corner.
This has been my only experience with an overflow of water onto the floor with this filter model. In my case, it was due to the floss pad being to snug around the foam insert.