[jxnbbl]

I used the Z clips with my ZAMP panels directly to the plywood. I worried about this so much until I actually did the install.

You can confirm the thickness by just taking out the interior of one of the vents but it the roof is "walkable" everyone I contacted said it is fine. I used SS screws and sealed the bracket "foot" and the screw with sealer. The pita was routing the wires and taping them in place. For now I just wound up the ends of the wires and taped the bundled wire loosely before plugging them into the roof cap. I intend to cut to size but just haven't gotten to it.

Good luck