Yes, Akira Toriyama ONLY stated that the movies were in a different dimension.....but yet Toriyama took one of those movies to heart and even inserted it in his manga. He even CREATED most of the characters and wrote a few stories. So go figure........Thing is, some elements of the TV series come from the movies. So if you consider the movies to take place in a "different dimension", what does that make the TV series? Your "anime canon" would have to ignore some parts of the TV series... either that, or you'd have some 'splaining to do in order to include the movies (or some of them) in the TV series continuity, "different dimension" be damned.
That's where the whole problem lies, in my opinion: the concept of "canon" is already a pretty subjective notion in itself (it's not like Toriyama himself went out and explained what was "canon" and what wasn't), and an "anime canon" would be even more subjective: will you ignore parts of the TV series? If so, which ones? Or will you try and include the movies? All of them? Some of them? Which ones? How?
Yes, you would have to ignore parts of the TV series, for example fillers that do NOT pertain to the regular storyline. Garlic Junior is ignored as well as Goku going to his Driver's ED classes. Filler's that do compliment Toriyama's storyline are always considered. For example Kid Buu in the manga...... when Kaoishin was talking about Buu was stated to have destroyed "Many planets"...but in the anime they go in depth and show Kid Buu destroying a galaxy. They go deeper into Goku's training (in Dragonball) with Mr. Popo showing you how to sense "spirit." Anime ADDED fight scenes between Vegetto and Super Buu 3 showing how powerful these two really are and showing the audience that these two are ABOVE the rest of the characters. Which the Manga fight barely even lasts two chapters.
My point is that the Dragonball Z Anime COMPLETED Toriyama's manga, explaining certain scenario's with MORE detail to TRY and give the audience a great reference point.

