I have used a Ctek 5.0 for a couple of years and is connected to the car via a comfort kit fitted into an aluminium bracket behind the rear bumper. As the car is on my drive and not garaged the plastic housing that is meant to fit in a dashboard is silicone sealed and the fly lead is configured to safely break away if i forget to unclip it when driving off. It is of course fused. It takes seconds to connect after putting on a car cover and could not be easier to use. Not sure where you could fit this if you do not have bumpers though.
