In my basement I'm on my third and final wall hung toilet. When we had the sewers put in years ago we had a 3" line come in at floor level to accommodate the wall hung toilet and the various sinks and laundry equipment. The first had a tank and after about a decade it failed, cracking along at the mount points, replaced that with a similar unit, again it failed.
After that I get fed up. Bought a commercial low flow unit and put in a Sloan flush valve. This will never fail as it is properly designed and built. Luckily all three matched up to the in wall carrier framed into 2x6 studs, no floor connection needed. Plus with the Sloan valve's pressure this thing has never backed up or gotten plugged. Kind of wish all my toilets had Sloan valves...