MVHR roof terminal for clay tiles

[Bruce]

I'm finally about to install the extract and intake ducts/terminals to our MVHR, I have abandoned the idea of venting to the facias as the space between the roof and the top of the external wall is only about 80mm so it will go through the roof instead. We have clay tiles that are about 160mm wide, picture from inside and outside of the roof below (sorry for that bad external picture, it's taken from the ground).

 

Would the Ubbink UB19 work for intake and extract? It looks like it replaces 1+2+3 tiles, is that correct? https://www.roofingsuperstore.co.uk/product/ubbink-ub19-500mm-x-460mm-slate-vent-anthracite.html

I would also have to add the 'adaptor' to be able to get the ducts on it + a steep down to our 120mm ducts. https://www.roofingsuperstore.co.uk/product/ubbink-felt-sleeve.html https://www.roofingsuperstore.co.uk/product/ubbink-stepped-adaptor-1.html

 

Can anyone spot anything wrong with my assumptions/ plans?