Rear Seat removal questions

[CrimsonEclipse]

2011 Yaris hatchback

I have already removed my rear seat previously to hold extra cargo.
(without the rear seat, the Yaris holds an absurd amount of cargo)

During the drive, I realized how much noisier it was at highway speeds, apparently the rear seat dampens outside noise quite a bit.

I would like to remove the rear seat long term and install some sort of insulation or covering to dampen the sound to pre-removal levels AND some sort of cargo management system, possibly nets or barriers.

Is there some sort of kit or available mod to assist this?

Thanks

Edit:
Whoever has the best solution can have the 60/40 rear seats!
(for free)