I don't know if you are looking at Accessories4less as a source for the Cantons, but they sell them along with Boston Acoustics, KEF, and Definitive Technology on-wall speaker:
Here are their on-wall offerings in order of price:
https://www.accessories4less.com/make-a-store/category/spkonwall/speakers/on-wall-speakers/1.html
Also, Axiom sells a pretty good selection of on-wall speakers.
https://www.axiomaudio.com/in-wall-on-wall-speakers
I have heard two Canton Bookshelf speakers and both seemed pretty nice for their A4L prices.
Outside of that, I would say to see if you can find equivalent bookshelfs or towers from the same brand using the same drivers to evaluate.
Generally I would expect good products from any of the 4 companies listed in my first paragraph... and Monitor Audio is also good!
Focal makes some great speakers, but I was disappointed with their on-wall SuperBirds so I cannot recommend them.