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The break even point from a price perspective on choosing MPPT to begin with is around 400 to 500 watts of solar. Since your over that one may have value but I don't see any way to justify the cost of two.
Looking at wiring options 3 panels, each 100 watts, will have a Voc of about 63 volts which should not be a problem for the MPPT CC. You of course have no choice but to use mppt when wiring panels in series.
The way I did it was 5 -100 watt panels in parallel. 3 are portable so I can get around the the shading issues. This allowed me to use a 45 amp PWM CC.
If you did something along these lines for your 6 panels the cost of two PWM cc's would be about the same as a single mppt.
Wiring costs would of course go up.
This maybe another option that lets you set up the system with a spare CC.
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2016 Axis 24.1 E-450 6 spd tranny
300 watts portable solar.
200 watts solar on the roof.
Wrangler JK dinghy
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