I bet Just Cruizin can help. I have one of his BL kits and I can't fault it...
There are 10 mounts. You can add others - you should be able to tell where they go from your chassis.
The mounts (8 shown) are the centres of the dimension in the bottom pic. The front is facing the left. If you look at the pic, on the big cross member where the floor steps up to the rear (where the 1100 dimension is) there is actually 4 mounts not 2 (giving you 10 in total).
I don't know what holds the little square rubber bits in other then the body and chassis either side of them, but you could use sikaflex or similar. I'd recommend putting something in where extra support is needed but I have only 10 mounts on one of my Sierras. The body has flexed when loaded and is torn in places though.
