I had a hard time deciding where to put it but just ended up putting it over top the new fuse box. I made my own relay box using the blank tray from
powertrays.com. It was one of the most difficult things I have done to my vehicle. Trying to screw in the two screws into the sidewall was near impossible with that new fuse box. I hope I never have to get into that fuse box because I don't think I will be able to put the powertray back on, let alone remove it.
I also had to clip the little retaining/grounding piece off the bracket that holds it to the sidewall. I will try and post pictures. I'm new around here so sorry for any formatting issues.
I think if I would do it again I would find a way to put it on the other side of the engine compartment, but then I would be restricting myself from a second battery.