Whats the best way to wire a Kicker L7 (2ohm) with a Alpine MRP-M1000?

You'll need to wire it up to 4ohms. The sub will be slightly underpowered, but that is your only option. You can't wire it up to 2ohms (as in: not possible) and if you wire it up to 1ohm you'll probably end up ruining the amp and/or blowing the sub (or the amp may just go into protect mode to keep that from happening).