those can be trouble ......
we had a public restroom where
their must have beena very large lady that slammed
down on one of those types of toilets... a few times every day
eventually she literally pulled the carrier out of the wall......
we rebuilt the wall and reinforced it as good as possible
but for extra measure,,,, I used a 3 inch PVC
pipe like a shim under the bottom of the toilet
down to the floor.. has not moved in 7 years.