I have a Cube and finally installed Tannus Armour in the rear Tyre. I was getting so many punctures even with a Mr Tuffy tyre liner.
I have 2.6 Nobby Nics.
Get the Tannus which goes up to 2.5. It fits perfectly.
You might want to use a smaller tube. I use a 2.5 max tube inside the Tannus and it’s great.
You are meant to use a reduced PSI of between 5 and 10 to your Normal pressure. I’m using 28 PSI at present and seems ok.
also if you did manage to get a flat which is very unlikely then the Tannus is thick enough to allow you to ride the bike slowly home.
I have heard of people using much too low a pressure in the Tannus and getting a pinch flat but if you use a sensible pressure then nothing really is going to puncture the Tannus. The thickness of it is incredible.
i guess the main drawback is the extra weight. It is twice the weight of a Mr Tuffy liner but probably 100x thicker. Therefore I’ve only got a Tannus in the rear at the moment.
some find it difficult to put in but it was fine and you will probably never have to do it again.
it really is a well made product. Virtually indestructible
the only video I saw where someone could cause a puncture with it in was to repeatedly stab the tyre with a dagger

They also managed to cause a puncture by taking most of the air out and repeatedly bashing the wheel on the edge of a brick to create a snake-bite pinch flat as the Tannus pinched the tube.