At least seven losses to a single dug in Pantherturm (among others) described on Gerry Chester's excellent site:
Photographs Italian Campaign
And more, including Gerry's own tank; Ballyrashane:
Churchill/Sherman Deployment, Page 3

Every account I read describes the well dug in and sited turrets in Italy as absolutely lethal, a reasonable supply of reconditioned Panther turrets with no chassis to mount onto, or perhaps turrets that were ordered for chassis that became Bergepanthers... a cost-effective use of them.