Had a Centaur for many years and the Tiger has similar high coamings.
I'd find a way to run a duct up there and put the opening on the
outside, Use a clamshell cover, open side down, to keep spray out.

Looked at the brochure justt now and see a layout diagram with 2 Q
berths, but no picture of them. But guessing they are similar to the
Centaur, you probably could run a duct in the aft of the Qberth. Cut a
hole to the lazarette, screw in a collar to attach the duct, run up in
the coaming to the the exhaust hole. Clamshells come in white plastic
and chrome.

Installing bilge blower on Westerly Tiger.

What is best place to place the 3 inch vent?

Would like to avoid cockpit area and that best would be through the
lazarette and then out, high up, through the transom?

But before we cut a 3 inch diam. hole in the stern of the boat!