New Guy Question on 2017 SR5 Access Cab-In Between Back Seats?

So I'm getting ready to put a 8" powered sub in between the back two jump seats. As I was looking back there I noticed 2 removable tabs in the plastic there. I pulled one off and it seems to be some sort of anchor point? Does anyone know what that is for-child seat or something like that maybe? Thanks for any ideas as that seems to be about the only option I have for the sub-just too tight under the seat as already have an Amp and LC6 to go under there.
Thanks again!

 

Yup, anchors for kiddie seats.

 

I see-thanks very much and the sub will fit nicely right there.....done with kiddie seats! thanks again!