I tried the spray silicone, and grease trick both didn't work for shit.
I just went to Toyota and ordered all new bumpers / bump stops and the squeeky hatch is now a thing of the past. As for who ever posted it was $10 for parts is WRONG, closer to $45 with tax if you replace all of them
Here is what I ordered.
The first two are the bumpers on the side of the hatch and the third spoiler
(2) 67293-14030 CUSHION, BACK DOOR, $13.33 EA $26.66
(2) 67281-20020 STOPPER, BACK DOOR, $5.44 EA $10.88
These are the bumpers on the bottom of the hatch
(2) 90541-09047 CUSHION $2.31 EA 4.62