What would you do in this case?

I need some recommendations.

I own a veloster 2016 and I don't want to take up more than 50% of the hatch. I have a 2200RMS@1ohm amp.

https://www.hyundaiusa.com/veloster/index.aspx

Without taking more than 50% of the hatch what do I install?

I'm thinking two shallow rockfords

http://www.amazon.com/Rockford-Fosgate-P3SD2-12-Shallow-Subwoofer/dp/B00852YVAA/ref=sr_1_1?s=car&ie=UTF8&qid=1443015814&sr=1-1&keywords=Rockford+Fosgate+Punch+P3+P3SD212

Also what components would you recommend that I can power off the stock head unit?

The car comes stock with a 450 watt system. How much of that goes to the comps idk.