Stobes like the FHT, or a few other brands, but FHT ARCIIs are brightest by far.
Too bright ?
Maybe.
They have ARCIIs (4 leds), Duals (2 leds), others are a mix or red / blue or red / white in public safety series ARCIIs.
There are also a couple of housed models like the 'Spark' strobe.
Google Firehouse Technology strobes, go to their own website to see all the range and order, Amazon etc don't list them all.
I have my duals on front arms (red and green as per nav setup), and one ARCII on rear in red / white.
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By FAR, the white leds are most visible, so if wanting total VLOS I'd just get a white ARCII and place it on the back, or underneath, if possible on the back slightly down is good.
Google strobes here on the forums (all forums search) there are a dozen or more recent threads with various makers and options, loads of pics.