Definitely do the AT screen, that way you can put speakers that might not be very pretty but can play very loudly/clearly while not costing nearly as much. For example, 3 of these across your front would normally be ugly as sin but they'll blow your socks off compared to any of the stuff your installer's recommended:
https://www.amazon.ca/800-Watt-Spea...nger+speaker&qid=1565401644&s=gateway&sr=8-21
If that's too radical for you, look into the NHT speakers sold here at very good prices:
https://www.amazon.ca/s?k=nht&ref=nb_sb_noss_2
Both of the packages your installer gave you are of very poor value.
General rule of thumb is, pay an installer to INSTALL ONLY. Any equipment you buy from an installer is bound to be hideously overpriced, i.e. giving him his cut.
And if you do free standing speakers behind an AT screen, zero need for an installer anyway. Try to use on-wall and wall mounted compact bookshelves for all surrounds and Atmos speakers too.
Lastly, avoid buying subs made by speakers-first companies...like the installer's recs, they are invariably overpriced and underperforming.
In Canada, this is your best bet for an HT sub:
https://www.electronicsforless.ca/svs-pb-1000-300-watt-dsp-controlled-10-ported-subwoofer-3884.html