then we have ...
single engine at night.
For me in 33 years :
No single engine over water I cannot glide over
No single engine IFR without reasonable cloudbase over the entire route to enable a FLWOP in the event of... through / below/ "ontop" is irrelevent.
No icing conditions,
and .. no single engine at night .. except perhaps for very tight circuits.
I hold these opinions because they all killed people I knew, and rather than leave aviation decided that they had not perished for nothing.
Read the AAIB reports .. and don't get complacent.