Wire it up however you like - it's a quad after all. The advantage of wiring it into the high beam circuit is that when you turn the bike off it's already wired through the ignition switch so you aren't leaving lights on. Quads only have a very small lightweight battery and there is no real reserve capacity in them for leaving lights on even if it's an LED light bar.
If it was me, I'd snip a wire powering the high beam circuit and using a solder splice or a duraseal (the solder splice is a heat shrink tube with a couple of grommets and a ring of solder, the duraseal is the same but with an electrical crimp connection in it). Reconnect the high beam cable with a wire running back to the bars and your on/off switch, and do the same with the light bars earth wire.
Solder splice https://www.bunnings.co.nz/narva-1-5...nator_p4430677
Duraseal https://www.smartmarine.co.nz/produc...iABEgJChvD_BwE
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