A110 Trickle Charging

I’ve been using a CTEK charger to trickle feed the batteries of my last few cars.

Can this be used to plug straight into the car in the same port as the Alpine charger in this video?

https://youtu.be/9HPSGnaayXE

I don't remember seeing the 12V socket in the frunk when I was sorting out my trickle charger. This was my solution which should work with the CTEK (though you may need a connector/adaptor of the right type)
viewtopic.php?t=9406&p=99792#p99792

This is really useful, thanks for the detailed advice!