It’s pretty simple. Just drill 9/16” holes where you want them and tap the hole with a 3/8”NPT tap. Take your time so you don’t go too deep and bottom out the fitting. Install 3/8”NPT male to -8AN male adapters. Then just make up some -8AN lines and connect them. I was thinking of running the lines under the runners, but I decided against it. I think it will add radiant heat directly under the runners and that’s creating another problem