What comprises romantic suspense?

I feel a smart-selling author  of Romantic Suspense must be aware of boundaries within a genre.  Here is what your book needs:  DANGER.  Allow me to expand.  Suspense incorporates a sense of tension throughout the book with heart-pounding action, adrenaline-inducing chase, edge of your seat thrills, life-threatening situations, and dangerous criminals. These are common elements.  ROMANCE. There’s a central love story.  Our lovers have to traverse nail-biting adventures before they become acquainted with each other and fall in love. As an author I weave both romance and mystery. May I leave you with a word of caution?  No backstory! The biggest error is over-writing and manufacturing emotions.  Characters must react in the present, be honest and real. They react to their situation and to each other.  Their issues are background.  Life is messy. The thrill ride is dangerous, authentic, eye-widening, and passionate.
What about the setting? It must fit with the action-adventure.  Why are they there, and where do they have to go? In Deadly Alliance the story begins in Lake Arrowhead, California, but the couple, Amy and Finn, follow a money laundering trail to Malahide Village, Ireland.