The modules are just little mini led strips. They don't actually control anything. They're handy if you just want a little area illuminated, or I've seen some use them under the seats. The strips are just longer and can be cut to length. As far as the controller goes, skyhigh's website says it outputs 12 amps. As long as you don't exceed a 12 amp current draw (led's are low power anyway), one controller should be fine. The website doesn't say the amp draw of the led's, but maybe it says on some paperwork in the box (never bought any, just know about leds). Also, if you want underbody and interior. You could do epic lighting inside, and the underbody kit of your choice. I've seen Jon from skyhigh use the waterproof strips under his trucks and they do just fine. Also the alarm flash, I don't know what alarm you have or how it works, and even if I did it probably wouldn't help much. Alarms normally have a light output or something of the sort to trigger your headlights or blinkers when the alarm is going off. Maybe tap into that with a relay to trigger the led's. I would wire in some diodes to prevent the current from backfeeding when your alarm triggers or when you just turn the led's on through the controller. Please take the alarm advice with a grain of salt. Someone who knows alarms a lot better could tell you more.