NINOX - Data Security in Cloud

I cannot find anything about NINOX security, only privacy. I can not find where a place where NINOX describe their physical or digital security measures. For sensitive client business, I feel uncomfortable to store client data on the NINOX cloud environment.

I can imagine that data is stored somewhere in Europe or the US.
If storage is not under full control, that may run-up against data sovereignty problem in particular, when working with government client data.

Would it be possible to provide a view of the storage data security within Ninox. Is there a way of control the data by setting up a system similar to a SQL Database in a secured environment?