I've used a small solar charger on several vehicles, it's enough to replace a small current drain from the battery. I've found they work better when placed on the top of the dash, obviously subject to shade. It means have a longer wire to get to the socket in the rear but for occasional use it wasn't a problem.
With mains chargers I've always used the terminal under the bonnet, I've never had any problems with not disconnecting the battery but I've always used an electronic, regulated charger/maintainer. Some of the older high current unregulated chargers can generate voltages well over 25 volts, personally I'd rather not risk it.
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