Heat is a big issue with these chargers. I used them with my previous car and to fully charge was about 14 hours from desperate, after which time the plug, lead and box were all quite hot. I had high quality, high rated extension leads, including externally rated socket at the end and still managed to melt a socket or two over 4 years. You need to make sure the connection is good, a loose plug will cause even more heat and will prove dangerous over an extended period.
As an additional thing to be aware of, many holiday let owners are now prohibiting these chargers in their properties on the excuse of safety. If you use one and they over heat you could find yourself in some severe trouble. There’s also a theory common amongst EV communities that this ban is partly to do with the impact that can have on the electricity bill, I’ve seen people charging 3 or 4 times in a fortnight stay, at 70ish kWh that’s quite some demand above what you’d expect from a normal holiday let use.
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I'll try to give my honest opinion but am always open to learning.
Mark