Squeaking and clicking from TRD skid plate

I have this annoying sound which I have been able to isolate to the TRD skid plate and now the rear bolts but... The video below has helped (answer was in comments section) but I’m still trying to get an answer as to exactly where to place the rubber washers/grommets for the fix??
The dealership blamed the aftermarket aluminum plates I put on in the rear as catalytic converter theft deterrents, turns out they were wrong.
https://youtu.be/I86ymtg6mE4

The layers from top to bottom:
1 Truck frame
2 Aluminum skid plate/cat deterrent
3 TRD skid plate
4 metal washer
5 bolt

 

between the top of the skid plate and the bottom of truck frame. I used rubber weather stripping that ran across the entire frame/skid plate instead of the rubber washers or grommets, but either option will work fine.

 

Here is my setup where my Cat and Skid plates meet. Seems to be working so far.

The layers from top to bottom:
1 Nut
2 Washer
3 Truck frame
4 Nylon Washer from Home Depot
5 Cat Plate
6 Nylon Washer from Home Depot
7 Skid plate
8 Large Rock Dome
9 Bolt head

 

@TBS awesome! Thanks man, I think I’ll set mine up the same and fingers crossed the sounds goes away.