I recently went with a LiFePO4 bank and moved my house bank and inverter from the ER to the aft lazarette. My goal was twofold: free-up ER space; and put the LFP batteries in an out-of-way place. Heat was not a concern - engine rooms I've been in have been hot but not overwhelmingly so, even in the tropics. I'd hazard a guess the OEM cautions were rooted in lawyers unsure of how people would configure their system. FLA batteries off-gas, inverters are generally NOT ignition protected so presence of gasoline would be a huge hazard.
Unless OP has a strong desire to move the batteries and inverter/charger, I'd keep it as-is. By far, biggest config issue remains long cable runs that foster voltage drop (and heat) so keeping them close to one another is a top priority.
Peter
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Cruising our 1970 Willard 36 trawler from California to Florida
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