IMO - no matter how many portfolios you have, you still need to be mindful of overall single stock allocation. So for example, if Telus and Granite are creeping up to 10% (each) of your portfolio, you may want to consider lightening up. For me at least, that would be too high for any single stock. I like to try and keep them around 5% of my overall portfolio (which includes ALL my stocks spread out across multiple accounts).
You can substitute for other stocks like BCE and Dream Industrial, but you also have to be mindful of over-allocating to a certain industry or sector as well. In your example, if I wanted to diversify a little more, I'd probably take CAR.UN over Dream because it is an apartment REIT - so a different industry. If say, GRT.UN is 5% and CAR.UN is 5%, then overall REIT is 10% (which is fine) but at least they are two different REIT industries. If you were to do GRT.UN and DIR.UN, then it would be 10% all in the Industrial industry - that may be a little much.
Trust that makes sense? Fell free to comment if you need more clarification.
Mat