Does it make sense to have more than 2 LUS / GSM?

Hello, is it possible to have more than 2 LUS / GSM in a grid? If this is technically possible, does it make sense? On the first glance the more LUS / GSM instances are in a grid, the more robust should a cluster be in a case of multiple hardware failures. Taking into account that a LUS / GSM instance has pretty low memory / CPU requirements, deploying many LUS / GSM does not add a lot of overhead.