Frunk bolts question for rig setup

Hey all

I'm looking to design something like "Frunkly" for our model Y. That being said, I haven't really found any info about the two bolts at the rear of the frunk.

Is there any issue removing these bolts? Does anyone know what size bolts they are and if they can be replaced with a longer bolt? I'm looking to bolt down the setup I've built for a retractable camping table but don't want to damage the car.

I appreciate the help!