Triple 8-inch turrets on a treaty cruiser

Could the Royal Navy fit a triple 8-inch turret on a 10,000-ton cruiser?

Yes, but the real design problem is how many can fit and what capabilities remain within the same hull.

A triple 8-inch mounting can be fitted to a 10,000-ton cruiser in principle. The harder questions are how many such turrets the hull can carry and which other capabilities must give way. Displacement alone therefore does not establish a balanced cruiser design. The passage separates the feasibility of one mounting from the compromises required across the whole ship.