Brenda, for sewerage ejector 2″ is more then enough for most residential usage.
In case of heavy usage conditions I use a grinder pump that turns sewerage into a slurry for ease of disposal with a 4″ discharge.
One sewerage ejector I installed had a 6″ discharge even though it had a 8″ inlet YET it could only pass 2″ solids as normally the largest obstacle is going to enter the soil system through a toilet and it only passes 1/3/4″ so anything over 2″ is just useless and most cities dont like large “solids” entering the drainage system.
I have seen a Zoller sewerage ejector pass a large rock with no apparent damage to the impeller.
The only thing I have found to disable most pumps/ejectors is feminine products that jam up the impeller.