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Hey, I've got two amps and each of them are grounded separately to the metal where the trunk carpet ends. Would it be better to ground them to the same point? Now the cables just won't reach each other. Thanks.

 
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i have mine grounded using my rear strut bolt in the trunk.

 
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I've got both of my amps grounded to one of the two bolts that holds down the trunk latch. in most installs i've heard it's best to have the same grounding point, less chance of introducing noise into your system is the reason why i believe, if you aren't getting any problems with ground loop/noise related issues then i see no reason to have the same grounding point. In my own experience, just make sure your ground wires are as short as possible and make sure your ground is as secure as possible, i had a loose ground once and while installing sound deadoning material i accidentally removed my ground wire/or loosened it it not sure exactly which one and i fried a hide-away dsp that i had for my HU.

As long as your ground is secure and you aren't having noise problems you should be fine with two grounds. Anybody feel free to correct me if i'm wrong since i am no expert.

 
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I used 1/0 awg wire into a distribution block then 4 awg to my two amps.. Using two different grounding points can give you a "ground loop"
So yes tom1178 is correct