The Ignitech modules are excellent, they are indeed plug and play, and they give you soft start behaviour.
I'm not sure why there is so much emphasis in UK on fitting them on the cockpit side of the firewall. The manufacturers are happy with them on the engine side of the firewall (at least as I read their instructions). They do insist they must be mounted remotely, not on the engine. I think this is as much to do with vibration as heat and is very sensible.
https://www.ignitech.cz/en/vyrobky/bikes/rotax/rotax_912_and_914/rotax_912_and_914.htm