Which version of L7 did you get, the dual 2-ohm or the dual 4-ohm? For the dual 2-ohm coils, that amp is perfect for them. For the dual 4-ohm coils, you need a different amp.
Yes. Each L7 is 750rms. So both would give you 1500rms.If you have the DVC 2ohm you can wire them to get the 1500x1@2ohm that the amp is stable at. This is how you would do it.
http://akamaipix.crutchfield.com/ca/learningcenter/car/subwoofer_wiring/2DVC_2-ohm_mono.jpg
It will work just parallel your subwoofer and it drop the ohm down to get the most out of your subwoofer, then if you want you could upgrade to the kicker zx2500.1