extractor fan and venting

Looking to install extraction for an en-suite and main bathroom while getting the en-suite renovated. The two share a stud wall and are upstairs with the attic above.

Had originally being looking at the following models for something reasonably quiet:
https://www.ie.screwfix.com/xpelair-c4tr-12w-simply-silent-contour-bathroom-extractor-fan-with-timer.html
https://www.ie.screwfix.com/xpelair-c4s-12w-simply-silent-contour-bathroom-extractor-fan.html

However the plumber is suggesting that it might be easier to use an in-line one as it can be more easily replaced looked at in the future as it would be raised out of the attic insulation if placing the vents in the ceiling.

Something like: https://www.ie.screwfix.com/vent-axia-acm100t-w-in-line-bathroom-extractor-fan.html

Given that the inline ones typically move much more air than the standard ones (220m3/hr vs 76m3/hr) is it possible to use the same inline one for both bathrooms effectively with a single output vent?
Likely some questions for an electrician there to ensure that it can be switched on from either bathrooms and only off if both are switched off.
Or would we still end up with needing a separate inline extractor for each bathroom?

One of the reasons to consider ceiling venting is the external wall for both is west facing (and second wall is south facing for the en-suite) I'm wary of these being exposed to the prevailing winds as I've lived places (parents house) where this was the case and there were some drafts and substantial noise from wind being blown in through vents that had a shroud such as https://www.ie.screwfix.com/manrose-cowl-vent-white-125mm.html

With ceiling extraction, this would mean venting out of the eaves or the roof, and as it's a hipped roof it seems likely that any roof tile vent would end up catching the wind as it would be coming out either the south or west facing roof.

So I'm thinking that the extractor vent would need to go out through the eaves but far enough away from any of the soffit vents to reduce the risk of moist air getting sucked back up.

But what type of vent cover would be needed for this?

Or is there a better type of roof vent that I should be looking at?

Would there need to be anything else considered, just a standard back draft preventer?