I am weighing up the safest sleep options for my baby once she arrives. I know it’s recommended to room share, however I feel my baby would be safest in her own room, with the fan in her room on, in the snoo bassinet where she can’t roll over, with the white noise machine on and the owlet sock monitoring her breathing and heart rate. I’m concerned that in our room where we don’t have a door our cat may jump into the bassinet and pose a risk to the sleeping baby. Given that room sharing is just one recommendation, am I right in assuming that the risk needs to be determined based on individual circumstances?

You are correct room sharing for the first 6 months is one of the safe sleep recommendations.
“The protective effect of room sharing can be partially explained by increased adult supervision and observation of the baby “
https://rednose.org.au/article/what-steps-can-i-take-to-sleep-my-baby-safely

The following article also includes this information:
Parents are not expected to observe their baby constantly. If your baby is sleeping in a separate room check baby regularly to ensure that the baby remains on the back and the head and face remain uncovered
https://rednose.org.au/article/room-sharing-with-baby

Red Nose also has extensive information on the following topics you mentioned
Home Monitoring -
https://rednose.org.au/article/home-monitoring
https://rednose.org.au/article/do-baby-monitors-reduce-the-risk-of-sudden-unexpected-death-in-infancy

Sleep positioners - https://rednose.org.au/article/is-it-safe-to-use-products-designed-to-keep-baby-in-a-particular-position

Bassinets - https://rednose.org.au/article/bassinets

Baby rolling - https://rednose.org.au/article/what-do-we-do-now-that-a-baby-has-started-to-roll-over