Canterburys should be fine in that room. In general, the Tannoys / Fynes are room friendly due to the dual concentric drivers and controlled dispersion. If you do run into issues, going closer (mid-field or even pseudo-nearfield) works well with these speakers, and can help. As always, bass response will come down to positioning of speakers and seating. You also get a little more control over bass with Canterbury’s adjustable venting. I guess I don’t fixate on room & treatments as much as others since Tannoys are more easy-going here.
The 15" drivers like Canterbury will have a tighter, smaller sweet spot than the 10" and 12" drivers. If you can't always sit in the sweet spot you'll be better served by a 10". Maybe even the dual 10" like Fyne 703.
The NAD "M" series class D amps are excellent. Their digital preamps however - not so much a fan of those. But then I don’t do HT or the room correction stuff - just pure 2ch.