also a power in isnt the way i would do it.
You need a class T fuse, and with only two batteries i would wire them paralleled to a class T to a smart lynx if you want. but save a metric ton of money and just use a smart shunt. The lynx is a really expensive pretty version of that. AIC of mega fuses arent enough so don't use a lynx distributor as your input either.
You could go MBRFon each battery then to the power in, but the cost of the MBRF and the lynx power in kinda make it worth it just to go Class T
are you planning on doing a cerbo?
Im in the middle of getting a 23 and doing 990ah of lithium in it and a full victron system as well.