Box ideas 2 fi n2 BTL 15's

[Amart88]

Hello, I have 2 fi btl 15's on their way and I was sitting here scratching my head over box plans for them, I plan on walling them off in my 2 door Pontiac G5. With each sub seperated. They will be run on 2 hifonics BRZ2100.1D's (one to each) and I wanted the box tuned around 34 Hz. I am having a tough time with figuring out the ports for them. my Max dimensions for the whole thing is H=30" W=40" and Depth=24" I figured a slot port in the center for each sub with a divider in between but it seems a port 28.5" tall is quite odd.

Any ideas or thoughs are appreciated, Thanks

EDIT = Heres my idea so far, not sure hot deep the port should be or if it will work like this, maybe put the port on top?