? on keyless install

Just a few ?s on installing my keyless entry system.

All parts of the install are pretty much straight forward with no problem. Except for how to hook up the wires(doesn't explain at all, beside what each wire goes to).

I have 2 wires that are to go to a constant 12v source. But one is for polarity, while the other is not, Can those 2 wires be hooked together at one power source?

Second there is about 4 or 5 wires that has to go to chasie ground. Can I hook all these wires to one grounding spot on the frame? Or due I have to hook each wire up by itselt to a ground?

Third,  Where is the best place under the dash to place the brain for the system? To get the best signal for the wireless part. I was thinking on the drivers side of the truck, or possible behind the glove box area of the truck

Thanks for you help guys!!!

It's made by IC Dynamics,    and it's the keyless entry with the 2 actulators in the kit.