Probably not a great idea.
With an all chain rode, you need a clean lead from the bow roller or whatever to the gypsey. If the unit is a capstan (verticle axis) the lead to below is utterly wierd. If a windless (horizontal axis) the need to get the chain to connect to the gypsey through ninty degrees will be lost by the chain arriving at the gypsey from a serious up angle.
Any rope-chain rode - probably on your port anchor assuming that you are a properly equipped and prudent cruiser who uses the a nchors regularly - will be unusable if you mount the unit below decks.
ALL quality hydraulic and electric units have mechanical back-up that's rendered functionless by mounting below decks.
All that said, if you want to go with one of those toy electic wind-ups beloved by charter fishing boats, you could mount such a thing below if you could solve the lead needed to let it level wind.
Find a windless that suits the aesthetics of your deck, put it out where it belongs, and use it with pride.
Last thought: If you go electric, consider having a spare battery up in the chain locker to serve as a voltage enhancer. Even with really heavy cable, the voltage drop is a major issue.
G'luck
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