How many movies have Giulio De Santi and Rayner Bourton collaborated on?

They have worked on 3 movies together! Their first movie together was Hotel Inferno (2013) while their highest rated movie together was Hotel Inferno 3: The Castle of Screams (2020). They have not worked together since Hotel Inferno 3: The Castle of Screams (2020). They are most known for their horror films together.