Is it safe to use a baby monitor with sleep sensor pad - are these safe for babies or is it more of risk given these sensor pads are placed underneath the mattress? Note: our bassinet mattress is only 5cm - however monitor manufacturer recommends 10cm thickness for mattress (however we're unable to find bassinet mattresses of 10cm thickness) should we not use the sleep sensor pad to be on the safe side

The routine use of a monitor has not been part of the Safe Sleeping Recommendations & the subsequent 85% reduction in infant death.
However, for some families the use of monitor may be helpful for reducing anxiety.
There is nothing wrong with using a monitor at home, but it is no substitute for safe sleep recommendations.

Red Nose has the following information about the use of home monitors.

There is no scientific evidence that using any type of monitor will prevent a sudden unexpected infant death.
Some manufacturers of home monitors make false claims that they prevent sudden death

https://rednose.org.au/article/do-baby-monitors-reduce-the-risk-of-sudden-unexpected-death-in-infancy

There is no scientific evidence that using any type of monitor will prevent a sudden unexpected infant death.
A monitor may be very disruptive for the family and some families find using devices can increase anxiety.
False alarms may occur if the baby is breathing shallowly, rolls off a mat, or there are technical problems with the machine.
https://rednose.org.au/article/home-monitoring