I have split the return, with ball valve stops, from heater which will connect to the bottom of the PVC sprinkler device. I drilled 1/8 holes and started with 5 on each side (can always add more). Today I want to attach it. Should I zip tie it to a metal post? Should the T be higher than pool edge? Any suggestions on installation. I added unions on either side of T so I can adjust the direction of the line of sprinkler holes.