amp grounding to same point or not?
 

I was wondering if it's necessary to run the ground wires from the same point?

I have 2 14mm bolts about 10-15cm apart under my rear seat and I needed to know if it's allright to run grounds from both. Or is it better from 1 point?

You can ground to more than one location. It will not hurt. I thought I read somewhere that you should avoid using a common ground... I still use my ground distrobution block with no issues though...

Remember to strip to bare metal!

You should always try to ground to the same point, for every new ground in the system there is a potential difference and then the is a chance for noise to be induced. I believe its called a ground loop, if you wanted to be really keen if there is noise with two seperate grounds run a wire between the two points joining them together.