Exposed terminals in the crowded confines under the seat are not the best plan

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Do it the 'factory' way with no additional space needed and use up the empty relay and fuse slots on your circuit fuse box

. Standard Furys should have 5 empty fuse slots and one empty relay slot. ABS Furys have only 2 empty fuse slots and one empty relay slot. If you have already looked there you will notice that Honda neglected to put any wiring or pin terminal clips in theses slots

. Easy solution lies at your local auto wreckers. I found terminal connectors for fuses and the two sizes needed for the relay, a small 4 pin relay and spare fuses in a 10 year old Toyota although I expect most Japanese vehicles are similar but they do change over the years.
No need to connect directly to the battery since Bat+ (constant) and Ign+ (switched) are at the circuit fuse box behind the right side cover. You can power source your new circuits by soldering a jumper wire to the existing 'hot' terminals in the circuit fuse box and connect to the new fuse terminals you install. One other tip is to solder (reliability) and shrink-wrap (insulation + weatherproofing) all new circuit connections outside the fuse box. In normal industry practice the center line of a fuse box is hot (power feeds from the battery and ignition switch) and the perimeter is fused but on my Fury it was random so this is a good time to swap out the connections so you know where your power is coming from

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The fuse connector and 'green' power port pics (switched cigar/GPS & battery 2.1x5.5mm) are attached below ...