[fintstone]

I bought three and gave my daughter one. I keep my 911s on them all the time and occasionally us one to bring my other cars up to 100% if it have been very cold or I have not driven them much. I bought extra wired connectors and wired each car for easy connect/disconnect (like these). Pair of Ctek US 7002 7000 3300 800 Battery Charger Extra Hardwire Cord Set Sets | eBay

For me, the cords are so thin that I can still close the hood and they feed through the hood gap.

I also got an 8ft extension for each that allows me even more flexibility. Ctek 12 6 Volt Smart Battery Charger Maintainer 8 Foot Extension Cable Cord | eBay
I can plug the box in, inside the garage (where it is dry and wont be stolen) and close the garage door on the cord with a car outside that I am charging. Our host sells these, but I couldn't seem to get the link/photo to post.

I use the lighter or clamp fittings on guests cars or those I have not wired.