The relay can be placed pretty much anywhere so it makes it convienient for somewhere between the battery/main power distribution panel and what ever device (for you the tower lights)your running. You still need to fuse the high current side that runs from battery to load(lights) seperately from the control side(dash switch- you already have a breaker, just make sure the control wire you use is capable of the full load up to the breaker size you are using...5 amps )from traces chart it looks like 16 gauge should be ok. On the load side, between the battery and lights and also back to ground you will require larger wire. I use the chart on west marines site myself (site is down right now but if you go to the west advisor section it has two charts, one for 3% drop and one i think has a 10% drop, their charts are based on the distance the wire is run.
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