I actually picked up an extra fuse/relay pox from a 93-94 Ranger that has the six relay holes and a bunch of maxi fuse and mini fuse slots. I pulled the rear cover off and rewired it so that the first six maxi fuses supplied power to the relays, then I used one of the mini fuse slots to supply power to the switch panel that controls the relays. I still have a few open maxi fuses for what ever I may add on, but for now I just used the six for the relays and one for an aux power point. I used the minis for my gauges and power mirrors. I mounted it above the glove box where the newer trucks have the pass side air bag. It looks factory.
I have a dual post battery so I just used the side lug to attach my 4 gauge power wire that runs to the fuse box.
PS. Solder and Shrink wrap everything. It may take longer at first, but it saves headaches in the long run. No worries about corrosion of loose connections causing issues.