Hello from Maryland! A laser jammer convert.
	
	
		RigToFly01, 95% of the laser guys here only use two heads unless they have a huge front vehicle like I have (Ford Truck) with chrome gills all over. ALP works perfect with two heads. I have personally tested with SadisticPatrons who uses two heads on his Audi and he got 100% JTG.  
Over kill is not necessary unless you cannot position the heads correctly and have them properly aligned. Hell, I have one head on my rear vehicle above my license plate, and it's huge rear end which when testing with one head it did great !!  I jammed 85% of the 6-7 laser guns tested with.  
That's how good one head works.  So two is plenty for any car unless they have a huge chromed out front grill like a truck. 
Not trying to be rude, but we are giving advice to a newbie. Ideally if we can all afford heads then let's just put four in front and rear, not like it's really necessary with ALP.
I am only speaking from my experience and from all the research I have done in the past year on ALP.  I'm sure you have a lot more experience than I do, I'm still a newbie here. 
No hard feelings, nothing but love.  Here, this is for you. Oxoxox.    LoL