I've got twin Nismo pumps in my tank.
Mounted either side of the cradle inside the tank, I sat a pump on each Side of the cradle, than put a large hose clamp around the 2 pumps and the cradle, and tighten them up.
For fuel lines I ran a line off each pump, into a Y section just before the lid of the tank.
For power I ran in 2 extra wires, for the second pump, they both ran on direct power to the battery, (which is in the boot) I have 2 relays 1 for each pump.
So far works perfect, never had any surging issues, even when running the tank low. Like real low, light being on.
The car only on 98 ATM with -5s. The fuel is setup for e85, when I'm home from work next, it's getting the intercooler changed and going for a e85 tune. So time will tell if its enough fuel, but I'm sure there will b heaps.