Evohome DHW Kit - where to fit temperature probe?

Hi all, looking to add an evohome hot water kit to our existing unvented cylinder. The electrics side of things is ok, but I’m struggling to find anywhere to put the thermal probe, as the cylinder only has one pocket and that is occupied by the existing dual thermostat.

Cylinder was only added a few months ago, so if there any way to avoid having to cut into the insulation, I’d rather do so if possible.

Any help appreciated.

G