I used the Tanks setup that you have pictured in my challenger. I mounted the fuel pump and baffle sideways so that I could have it sit lower in the tank. It also provided the clearance for the factory fuel level sender. I am very pleased with how it works. I have drained the tank down to where it took a little over 16 gallons to fill, and have had no fuel starvation issues.
I originally had an external pump mounted to the cross member in front of the tank. I used the factory pick up and had starvation issues when the fuel level was below half tank. Also, the noise drove me crazy! The in-tank pump fixed both issues.