electric eq and 2nd amp wireing

hi to all im stuck at the moment on how to wire an eq and 2nd amp,i know i need to use a relay .my question to all is could i put the relay in the back of the car and split it from there or do i have to wire it in the front close to the battery ? Ive always had it close to the front but as im installing the above into a ford focus i dont want to drill any holes ,but if i have to i will any help would be appreciated
thank you

So you already have 1amp installed?

yes ive got an amp for my sub

You only need the relay if its not strong enough to turn everything on..is the eq by the headunit?
You can tap of the lead in the back for your other amp too...

hi yes the eq is under the head unit ,just dont want to damage the headunits remote on circuit hence the relay .