Here's mine, finished a few weeks ago. Border around the pool runs level with the rail, and the contractor hugged the rail so tight you couldn't fit a leaf through there, which is what I wanted. Loop-loc pool cover apparently came out with an anchor system specifically for composite decking, I'm looking into ordering it. Looks like it "hugs" the deck boards instead of drilling into them.
I have a 15 month old, so keeping little ones out was important. you can see in some of the pics there's an opening between the 2 sections of deck (kind of a "dining" area, then the "swimming" area), that opening is now closed off with a magnetic locking auto-close gate. Everything else is separated by railings.
Let me know if you have any questions!
The full build is in the link in my signature
Good luck on your project!