Hiii!! Welcome to the site

It's great that you've done so much research. It makes me so upset when I hear about persians being dumped at shelters or being rehomed on CL because they didn't realize how much work was involved.
I have 3 and they all have different purrrsonalities. Maddie (16 years old in signature) doesn't really like kids too much - I got her before they were born and then my son wasn't always the most calm child (

) but she never acted aggressive towards him in any way. She just avoids
My other two boys (Jasper - crazy - and Jacob - calm -) are 2 and 3 and when my friend's toddler comes over she usually goes looking for them straight away (poor things!). We just teach her to be very calm and pet them softly and they are good with her - until she forgets her "be nice to kitty" manners and they run for cover.
It's hard to really know what a cats personality is going to be but as long as they have come from a loving environment and continue to be in one the worse case scenario would be indifference as opposed to aggressive behavior.
Good luck!